What do you mean by "seven-day chain"

Seven days is the name of an economical hotel chain. "Seven Days Chain" only represents hotels, not other meaning.

I stayed for seven days several times, which was ok and economical. Because the brand has not been established for a long time, many cities have just opened for seven days, which is relatively clean. Most cities stay in the city for seven days, so it is convenient to go out for business and shopping.