How long can they stay in dixie cups?

I've got a small stealth grow and I really doubt if I'd be able to fit all my plants in big pots. How long can I keep them in dixie cups? Are there any alternatives to big gallon-sized pots?

Look for the party cup contest thread, you will learn how to do the whole grow in a red party cup,,,,,,,,,,,,,,,,,,it's what they do a grower named SICC is the guy to ask questions, he's a great grower and will help you

here is the link to the current one
https://www.rollitup.org/cfl-growing/289369-3-strain-party-cup-grow.html

have fun