how long will it take for teeth to move without retainers?

I left mine at my dads and I didn't realize this till I got back to college. It's been a week now and I only have a week left till I go home. I've also have been wearing mine for years now (maybe at least five or six years). I don't want my dad to send them up since it is so close to school ending but I'm worried about my teeth moving because it happened once before when I wad younger and ended with me getting braces again on my teeth followed by a wire behind them. Can I make it one more week without them?