It will be your responsibility to finalize the time of the sit at the end of the job to ensure you get paid the correct amount. Once the parent returns home, go to your booking screen and either stop the timer or go the confirmation screen and adjust the final time (if necessary). Once you confirm the time and number of children, a message will be sent to the parent to review and add any tips or reimbursements.
You have 24 hours to complete this before the original booking time will be charged. However, you want to make sure you complete this ASAP in order to receive the correct amount and get paid more quickly.