As your part-time housekeepers become more familiar with your home, they naturally become more efficient in completing their regular cleaning tasks. As such, you may find that they tend to finish earlier than expected.
If you wish, you can also update us on the actual time the cleaner took for the completion of his/her tasks. We can amend your booking accordingly, and refund you the excess payment, so you would only pay for the amount of cleaning time you've received.
If you have a weekly booking, you can inform us to reduce the weekly cleaning duration accordingly. Otherwise, we suggest that you can also make an 'Extras' list i.e. things that they can move on to if they finish early.