How do observe the overall time when the start time comes out in Info? Or I want to see the time when the measurement is finished.
I’m not 100% clear what you’re asking for… do you want the “wall clock” time when the recording started or ended? If so:
from datetime import timedelta
print(raw.info['meas_date']) # start
print(raw.info['meas_date'] + timedelta(seconds=raw.times[-1])) # end