The Subway hours of operation, or when does subway open and when does Subway close will vary from location to location but it can be predicted. Subway hours are determined by how many customers they can serve at different times of the day. There are three main types of Subway business hours systems.
The rural/old person area Subway:
The Suburban Family Subway
The Older Family Subway (closer to high school crowd or young adult community)
The Urban Worker Bee Subway
The College Town Subway
All the time, might be 24 hours