Even in cities with public transit often it is so bad that isn't reasonable to expect someone to use it. Reasonable transit must run 24x7/365, at least every half an hour. Miss a day and someone can't get someplace they might want to. More than half an hour between bus/trains and it isn't reasonable. Miss the over night - maybe you can do this if you have taxi service for the same price (which might be cheaper overall for the few people who want to ride at 3am). Half hour is the minimum, it is possible to plan your life around that level of service and not be impacted too badly, but you will hate it (particularly when the line is a little longer than you expected: you miss your bus and so your ice cream melts by the time the next comes)