Yeah, that's not acceptable unless he's paying you to be available into the evening. You should take a look at this video short - you might already have 'met' Veronika online: https://www.youtube.com/watch?v=1TJKZ6O_mcg&list=PLtu1OnhGPh2WP4GSERFiI8ckMYZzogXtG&index=23