(11 Nov 2022, 9:02 pm)R852 PRG wrote Split shift drivers work fixed shifts of 7 hours and 48 minutes which meets the 39 hour guarantee exactly. If a driver is full-time, their rota must allocate them at least 39 hours of work to meet their terms and conditions. The 39 hour guarantee applies to all full-time drivers regardless of their rota. 

For some splits, which do not have enough runs to cover the full 7 hours and 48 minutes, the scheduler will include a period on standby in either half to make up the shortfall before they are released from either split. Not all splits are created equally - one might involve a couple of hours or so in the morning, but then be nigh on five hours in the afternoon, often well into the evening.

As a rule.of thumb, it should be drivers taking the last buses out and the first buses back within whatever the confines of the max spread times are. 

If Split drivers aren't taking buses out and back then they are effectively pointless as you don't save any standard duties.