Work Manager Time confirmation on Order Completion

Hello all,

What is the logic behind the times that are defaulted on the "Add time" screen after selecting to complete a Work Order.

I assumed that it keeps track of the time since the order was started. We get what seems to be quite random values defaulted. The example below came up with 15 Minutes, but It was over an hour since I started the order.

Any help will be appreciated.

Lukas