Renting and snow removal

If you are currently or have rented somewhere that included snow removal, when did the landlord normally have the plowing done?

My landlord goes out of state during the winter and his son will come and plow the driveway. However, he doesnt come until 6PM every time regardless of if its still snowing or if the snow has been done for 12 hours. I understand he has his own things to be doing but by the time he comes we've already had to shovel ourselves out because we still have work and obligations. I'm glad he comes at all and maybe I'm being unreasonable but I would think it should be done in the morning after we get 7 inches of snow or even some time before 6pm when we are getting out home from work and cant even make it back into the driveway?

I dont expect him to be at our beck and call to plow the driveway, but I feel like 6PM is awfully late and just a bad time overall to plow all the time, every time.