May the boss demand that you have been in service as a driver for 14 hours

Hay, a few days ago I drove back and forth between the depot and a customer with a forty-ton tractor (case) , On the last tour I thought to myself inside , well now I have 11.5 hours full and then go to work and drive again to Burger King and sleep so slowly (in the truck ) . But nIx da . While I was in the warehouse at unloading , the dispatcher came and said to me : you have to drive another tour . I replied : if I did this I was 14 hours un terwegs,I didn’t plan to work and sleep. The next day the boss came to me and explained by reason of willingness trallala and some shit nonsense. To be brief: As in the truck sleeper, how long can you have been on the road even if it was only all willingness/would have been ? LG