Restaurant bookings: question before purchase

I want to have juts an arrival date and time as each table is booked for a two hours period in my restaurant.

1. If I don’t specify a departure time/date – it specifies it as arrival + one billing period (hourly) so will only let me book tables for one hour after midday
2. I can set the billing period to 10 and hide the field and this will set the departure time for all, but this sets the departure time to 22:00 for all bookings.

Is there a way around this?

Thanks