diff --git a/lib/loadtesting.js b/lib/loadtesting.js
index 282c818..e825074 100644
--- a/lib/loadtesting.js
+++ b/lib/loadtesting.js
@@ -48,9 +48,9 @@ var TEST_OPTIONS = {
     requestGenerator: undefined,            //   1. requestGenerator: a function
                                             //         function(http.Client) ->  http.ClientRequest
     requestLoop: undefined,                 //   2. requestLoop: is a function
-                                            //         function(loopFun, http.Client)
+                                            //         function(finished, http.Client)
     method: 'GET',                          //     If must call:
-    path: '/',                              //         loopFun({
+    path: '/',                              //         finished({
     requestData: undefined,                 //             req: http.ClientRequest, 
                                             //             res: http.ClientResponse});
                                             //     after each transaction to finishes to schedule the 
diff --git a/lib/loop/multiloop.js b/lib/loop/multiloop.js
index 0e5d277..e877e81 100644
--- a/lib/loop/multiloop.js
+++ b/lib/loop/multiloop.js
@@ -83,16 +83,17 @@ MultiLoop.prototype.getProfileValue_ = function(profile, time) {
 };
 
 /** Given a profile in the format [[time, value], [time, value], ...], and the current time, return the
-number of milliseconds before the profile value will change by 1. */
-MultiLoop.prototype.getProfileNextTimeout_ = function(profile, time) {
+time (rounded up to the nearest whole unit) before the profile value will change by 1. */
+MultiLoop.prototype.getProfileTimeToNextValue_ = function(profile, time) {
+    if (!profile || profile.length === 0) { return Infinity; }
     if (time < 0) { return -time; }
 
-    var MIN_TIMEOUT = 1000, lastval = [0,0];
+    var MIN_TIMEOUT = 1, lastval = [0,0];
     for (var i = 0; i < profile.length; i++) {
         if (profile[i][0] > time) {
-            var dt = profile[i][0]-lastval[0],
-                millisecondsPerUnitChange = dt / (profile[i][1]-lastval[1]) * 1000;
-            return Math.max(MIN_TIMEOUT, Math.min(dt, millisecondsPerUnitChange));
+            var dt = (profile[i][0]-time),
+                timePerUnitChange = dt / Math.abs(profile[i][1]-lastval[1]);
+            return Math.ceil(Math.max(MIN_TIMEOUT, Math.min(dt, timePerUnitChange)));
         }
         lastval = profile[i];
     }
@@ -103,7 +104,9 @@ MultiLoop.prototype.update_ = function() {
     var i, now = Math.floor((new Date() - this.startTime) / 1000),
         concurrency = this.getProfileValue_(this.concurrencyProfile, now),
         rps = this.getProfileValue_(this.rpsProfile, now),
-        timeout = Math.min(this.getProfileNextTimeout_(this.concurrencyProfile, now), this.getProfileNextTimeout_(this.rpsProfile, now));
+        timeout = Math.min(
+          this.getProfileTimeToNextValue_(this.concurrencyProfile, now), 
+          this.getProfileTimeToNextValue_(this.rpsProfile, now)) * 1000;
     
     if (concurrency < this.concurrency) {
         var removed = this.loops.splice(concurrency);
diff --git a/test/loop.test.js b/test/loop.test.js
index 419fcfb..601dfe8 100644
--- a/test/loop.test.js
+++ b/test/loop.test.js
@@ -151,5 +151,60 @@ module.exports = {
         assert.equal(getProfileValue(profile, 31), 250);
         assert.equal(getProfileValue(profile, 32), 0);
         assert.equal(getProfileValue(profile, 35), 0);
+    },
+    'test MultiLoop.getProfileTimeToNextValue_ works': function() {
+        var getProfileTimeToNextValue = loop.MultiLoop.prototype.getProfileTimeToNextValue_;
+        assert.equal(getProfileTimeToNextValue(null, 10), Infinity);
+        assert.equal(getProfileTimeToNextValue([], 10), Infinity);
+
+        assert.equal(getProfileTimeToNextValue([[0,10]], 0), Infinity);
+        assert.equal(getProfileTimeToNextValue([[0,0],[10,0]], 0), 10);
+        assert.equal(getProfileTimeToNextValue([[0,0],[10,100]], 0), 1);
+        assert.equal(getProfileTimeToNextValue([[0,0],[10,0]], 4), 6);
+        assert.equal(getProfileTimeToNextValue([[0,0],[10,5]], 4), 2);
+        assert.equal(getProfileTimeToNextValue([[0,0],[10,5]], 4.5), 2); // should round up to nearest whole number
+        assert.equal(getProfileTimeToNextValue([[0,0],[10,5]], 5), 1);
+        assert.equal(getProfileTimeToNextValue([[0,0],[10,0]], 10), Infinity);
+        
+        var profile = [[0,0],[10,100],[15,100],[22,1],[30,0]];
+        assert.equal(getProfileTimeToNextValue(profile, -1), 1);
+        assert.equal(getProfileTimeToNextValue(profile, 0), 1);
+        assert.equal(getProfileTimeToNextValue(profile, 1), 1);
+        assert.equal(getProfileTimeToNextValue(profile, 1.5), 1);
+        assert.equal(getProfileTimeToNextValue(profile, 10), 5);
+        assert.equal(getProfileTimeToNextValue(profile, 13.5), 2);
+        assert.equal(getProfileTimeToNextValue(profile, 15), 1);
+        assert.equal(getProfileTimeToNextValue(profile, 21), 1);
+        assert.equal(getProfileTimeToNextValue(profile, 22), 8);
+        assert.equal(getProfileTimeToNextValue(profile, 28.5), 2);
+        assert.equal(getProfileTimeToNextValue(profile, 29.5), 1);
+        assert.equal(getProfileTimeToNextValue(profile, 30), Infinity);
+    },
+    'test MultiLoop.getProfileValue_ and MultiLoop.getProfileTimeToNextValue_ coordination': function() {
+        var getProfileValue = loop.MultiLoop.prototype.getProfileValue_;
+        var getProfileTimeToNextValue = loop.MultiLoop.prototype.getProfileTimeToNextValue_;
+        var profile = [[0,0],[10,100],[15,100],[22,500],[30,500],[32,0]];
+        assert.equal(getProfileValue(profile, 0), 0);
+        assert.equal(getProfileTimeToNextValue(profile, 0), 1);
+        assert.equal(getProfileValue(profile, 1), 10);
+        assert.equal(getProfileTimeToNextValue(profile, 1), 1);
+        assert.equal(getProfileValue(profile, 9), 90);
+        assert.equal(getProfileTimeToNextValue(profile, 9), 1);
+        assert.equal(getProfileValue(profile, 10), 100);
+        assert.equal(getProfileTimeToNextValue(profile, 10), 5);
+        assert.equal(getProfileValue(profile, 15), 100);
+        assert.equal(getProfileTimeToNextValue(profile, 15), 1);
+        assert.equal(getProfileValue(profile, 16), 157);
+        assert.equal(getProfileTimeToNextValue(profile, 16), 1);
+        assert.equal(getProfileValue(profile, 21), 442);
+        assert.equal(getProfileTimeToNextValue(profile, 21), 1);
+        assert.equal(getProfileValue(profile, 22), 500);
+        assert.equal(getProfileTimeToNextValue(profile, 22), 8);
+        assert.equal(getProfileValue(profile, 30), 500);
+        assert.equal(getProfileTimeToNextValue(profile, 30), 1);
+        assert.equal(getProfileValue(profile, 31), 250);
+        assert.equal(getProfileTimeToNextValue(profile, 31), 1);
+        assert.equal(getProfileValue(profile, 32), 0);
+        assert.equal(getProfileTimeToNextValue(profile, 32), Infinity);
     }
 };
\ No newline at end of file