I understand as guest in Tokyo it would be rude to ride the subway and the rails from 6am to 9am on weekdays? same rules for weekend? What are the no go hours for afternoons.

Train distance time rules? If I ride from Tokyo station to Omiya,no exit and back Omiya to Kanda that would be about two hours? Would that attract unwanted attention at the exit ticket gate? Is it best use an ic or paper ticket, any difference

Thanks