It takes seven or eight hours for an international flight to transfer. Will the airline arrange hotels?

Usually not. You need a visa to get through customs. You can't get out of the connecting airport in other countries, so you can only stay in the airport and see if there is a rest place in the airport terminal.

Because of the delay, the connecting flight missed the next flight. Solution:

It doesn't matter if it's a joint ticket. The airline will be responsible for changing your next flight for free. The connecting ticket can be connected by several different airlines, but it doesn't mean that any two airlines can be connected, depending on the specific situation. Please be sure to consult your ticket sales agent.

If it's not a joint ticket, I'm sorry. In this case, you must bear the loss yourself and buy a new air ticket. If it is confirmed that the first paragraph will be delayed, you can refund the ticket in advance or change the ticket in the latter paragraph, but many discounted tickets do not accept refund or change, please also confirm with the ticket sales agent.

Flight delay: free ticket change, itinerary modification, or full refund of purchase price.

I delayed my flight for personal reasons. You can change your visa in either case. The former airline will try its best to meet your time requirements and make you satisfied, and you have certain priority. The latter may (just may) need to add some handling fees, and you have no priority in time.