diff --git a/antarest/launcher/adapters/slurm_launcher/slurm_launcher.py b/antarest/launcher/adapters/slurm_launcher/slurm_launcher.py
index d2ce3ad1ec..6aba6f21b3 100644
--- a/antarest/launcher/adapters/slurm_launcher/slurm_launcher.py
+++ b/antarest/launcher/adapters/slurm_launcher/slurm_launcher.py
@@ -513,22 +513,15 @@ def _apply_params(self, launcher_params: LauncherParametersDTO) -> argparse.Name
                 ):
                     other_options.append("xpansion_sensitivity")
 
-            time_limit = launcher_params.time_limit
-            if time_limit is not None:
-                if MIN_TIME_LIMIT > time_limit:
-                    logger.warning(
-                        f"Invalid slurm launcher time limit ({time_limit}),"
-                        f" should be higher than {MIN_TIME_LIMIT}. Using min limit."
-                    )
-                    launcher_args.time_limit = MIN_TIME_LIMIT
-                elif time_limit >= MAX_TIME_LIMIT:
-                    logger.warning(
-                        f"Invalid slurm launcher time limit ({time_limit}),"
-                        f" should be lower than {MAX_TIME_LIMIT}. Using max limit."
-                    )
-                    launcher_args.time_limit = MAX_TIME_LIMIT - 3600
-                else:
-                    launcher_args.time_limit = time_limit
+            # The `time_limit` parameter could be `None`, in that case, the default value is used.
+            time_limit = launcher_params.time_limit or MIN_TIME_LIMIT
+            time_limit = min(max(time_limit, MIN_TIME_LIMIT), MAX_TIME_LIMIT)
+            if launcher_args.time_limit != time_limit:
+                logger.warning(
+                    f"Invalid slurm launcher time_limit ({time_limit}),"
+                    f" should be between {MIN_TIME_LIMIT} and {MAX_TIME_LIMIT}"
+                )
+            launcher_args.time_limit = time_limit
 
             post_processing = launcher_params.post_processing
             if post_processing is not None:
diff --git a/antarest/launcher/model.py b/antarest/launcher/model.py
index a8f856269d..3bd3427a07 100644
--- a/antarest/launcher/model.py
+++ b/antarest/launcher/model.py
@@ -25,13 +25,14 @@ class LauncherParametersDTO(BaseModel):
     adequacy_patch: t.Optional[t.Dict[str, t.Any]] = None
     nb_cpu: t.Optional[int] = None
     post_processing: bool = False
-    time_limit: t.Optional[int] = None  # 3600 ≤ time_limit < 864000 (10 days)
+    time_limit: int = 240 * 3600  # Default value set to 240 hours (in seconds)
     xpansion: t.Union[XpansionParametersDTO, bool, None] = None
     xpansion_r_version: bool = False
     archive_output: bool = True
     auto_unzip: bool = True
     output_suffix: t.Optional[str] = None
     other_options: t.Optional[str] = None
+
     # add extensions field here
 
     @classmethod
diff --git a/tests/launcher/test_slurm_launcher.py b/tests/launcher/test_slurm_launcher.py
index a3a8cfe90b..e1c69f63d4 100644
--- a/tests/launcher/test_slurm_launcher.py
+++ b/tests/launcher/test_slurm_launcher.py
@@ -10,7 +10,6 @@
 from antareslauncher.data_repo.data_repo_tinydb import DataRepoTinydb
 from antareslauncher.main import MainParameters
 from antareslauncher.study_dto import StudyDTO
-from sqlalchemy.orm import Session  # type: ignore
 
 from antarest.core.config import Config, LauncherConfig, NbCoresConfig, SlurmConfig
 from antarest.launcher.adapters.abstractlauncher import LauncherInitException
@@ -37,7 +36,7 @@ def launcher_config(tmp_path: Path) -> Config:
         "key_password": "password",
         "password": "password",
         "default_wait_time": 10,
-        "default_time_limit": 20,
+        "default_time_limit": MAX_TIME_LIMIT,
         "default_json_db_name": "antares.db",
         "slurm_script_path": "/path/to/slurm/launcher.sh",
         "partition": "fake_partition",
@@ -203,11 +202,14 @@ def test_extra_parameters(launcher_config: Config) -> None:
     launcher_params = apply_params(LauncherParametersDTO(nb_cpu=999))
     assert launcher_params.n_cpu == slurm_config.nb_cores.default  # out of range
 
+    launcher_params = apply_params(LauncherParametersDTO.construct(time_limit=None))
+    assert launcher_params.time_limit == MIN_TIME_LIMIT
+
     launcher_params = apply_params(LauncherParametersDTO(time_limit=10))
     assert launcher_params.time_limit == MIN_TIME_LIMIT
 
     launcher_params = apply_params(LauncherParametersDTO(time_limit=999999999))
-    assert launcher_params.time_limit == MAX_TIME_LIMIT - 3600
+    assert launcher_params.time_limit == MAX_TIME_LIMIT
 
     launcher_params = apply_params(LauncherParametersDTO(time_limit=99999))
     assert launcher_params.time_limit == 99999
diff --git a/webapp/src/components/App/Studies/LauncherDialog.tsx b/webapp/src/components/App/Studies/LauncherDialog.tsx
index 1419bfe6ac..7e610e2f88 100644
--- a/webapp/src/components/App/Studies/LauncherDialog.tsx
+++ b/webapp/src/components/App/Studies/LauncherDialog.tsx
@@ -38,8 +38,10 @@ import CheckBoxFE from "../../common/fieldEditors/CheckBoxFE";
 import { convertVersions } from "../../../services/utils";
 import UsePromiseCond from "../../common/utils/UsePromiseCond";
 import SwitchFE from "../../common/fieldEditors/SwitchFE";
+import moment from "moment";
 
-const LAUNCH_LOAD_DEFAULT = 22;
+const DEFAULT_NB_CPU = 22;
+const DEFAULT_TIME_LIMIT = 240 * 3600; // 240 hours in seconds
 
 interface Props {
   open: boolean;
@@ -53,8 +55,9 @@ function LauncherDialog(props: Props) {
   const { enqueueSnackbar } = useSnackbar();
   const enqueueErrorSnackbar = useEnqueueErrorSnackbar();
   const [options, setOptions] = useState<LaunchOptions>({
-    nb_cpu: LAUNCH_LOAD_DEFAULT,
+    nb_cpu: DEFAULT_NB_CPU,
     auto_unzip: true,
+    time_limit: DEFAULT_TIME_LIMIT,
   });
   const [solverVersion, setSolverVersion] = useState<string>();
   const [isLaunching, setIsLaunching] = useState(false);
@@ -170,12 +173,16 @@ function LauncherDialog(props: Props) {
   // Utils
   ////////////////////////////////////////////////////////////////
 
-  const timeLimitParse = (value: string): number => {
-    try {
-      return parseInt(value, 10) * 3600;
-    } catch {
-      return 48 * 3600;
-    }
+  /**
+   * Parses an hour value from a string and converts it to seconds.
+   * If the input is invalid, returns a default value.
+   *
+   * @param hourString - A string representing the number of hours.
+   * @returns The equivalent number of seconds, or a default value for invalid inputs.
+   */
+  const parseHoursToSeconds = (hourString: string): number => {
+    const seconds = moment.duration(hourString, "hours").asSeconds();
+    return seconds > 0 ? seconds : DEFAULT_TIME_LIMIT;
   };
 
   ////////////////////////////////////////////////////////////////
@@ -265,9 +272,10 @@ function LauncherDialog(props: Props) {
             label={t("study.timeLimit")}
             type="number"
             variant="filled"
-            value={(options.time_limit ?? 864000) / 3600} // 240 hours default
+            // Convert from seconds to hours the displayed value
+            value={(options.time_limit ?? DEFAULT_TIME_LIMIT) / 3600}
             onChange={(e) =>
-              handleChange("time_limit", timeLimitParse(e.target.value))
+              handleChange("time_limit", parseHoursToSeconds(e.target.value))
             }
             InputLabelProps={{
               shrink: true,