→ settings / booking rules / Availability mode: High End
→ services / service settings / Service break

Use this option if you provide a service that has a “waiting time” during its execution such like “hair colouring”.

The “service break” splits up the service in two equal parts, and you can receive new reservations during the “waiting time” according to the length of the break you set.

The break length options are related to the “Average session duration” option.