I would have helped but I'm not really a commercial cleaner and I would have probably just pi$$ed you off like I do most others anyway. lol
As for what time you would clean: You said you have done almost all types of commercial cleaning so isn't that kind of a silly question since you are already doing it. Ask yourself.... what time do I clean now and what time have I cleaned in the past. See, you answered your own question.
How to 'advertise' and get more customers? If you would read some of the threads in the commercial section you would know how to do it. Heck, I even answered a few of those myself. But since you are too lazy to read let me help ya out a little. Turn off the tv... pull the phone out of your pocket... start calling businesses. I know, you want to make it harder than it really is... lots of people try to make it harder but it's really not. If you don't like talking on the phone, better get back to that $9 an hour janitor job.