Need some professional input here guys!!! I just picked up a condiminum snow removal account of 9 buildings. The drives are short (approximately 25 feet long) and wide enough to fit two cars comfortably. Also, i have to clear the walks to the drive which are at the most 15 feet. It will take approximately 20-30 minutes each drive. Do you have a set rate you would charge for each building or would you charge by the hour? Thanks for your input!!!