Was told to drop car off at 11am and it will take ...

Was told to drop car off at 11am and it will take 1 hour. When i got there i was informed my car would be there for 5 hours. I had my 2 kids under 2 with me as i thought 1 hour i would just go for a walk. Had i been told 5 hours i would have organised to be picked up as it was my car was not ready till around 5.20pm. Maybe just inform people when car is being booked in.