Expose starting time in `mock_ElectricalSeries` #743

Job	Run time
conda-linux-python3.11-ros3	2m 46s
conda-linux-python3.8-minimum	3m 39s
conda-linux-gallery-python3.11-ros3	2m 5s
conda-linux-python3.11-upgraded	3m 28s
linux-gallery-python3.8-minimum	2m 18s
linux-python3.8-minimum	3m 20s
linux-gallery-python3.11-upgraded	2m 11s
windows-gallery-python3.8-minimum	3m 16s
linux-python3.11-upgraded	2m 57s
windows-gallery-python3.11-upgraded	3m 29s
windows-python3.8-minimum	4m 27s
windows-python3.11-upgraded	4m 16s
macos-python3.8-minimum	5m 38s
Deploy pre-release from dev	0s
	43m 50s

Provide feedback