i don't start the truck-mount up until 8.30am and i like to finish as early as i can, if i'm still working at 6pm, watch out, i'll be mr grumpy!! in the early days had an irish lady threaten to take a hammer to the engine if i didn't turn it off at 11pm, she had a point though it was the summer and you had to have the windows open for fresh air, don't think it's such an issue in the winter when the windows are shut and the telly is on people don't hear much.
colin