Does it mean the play has to be of 3 acts? Do they have 2 or more cast members? Does it have to have an interval?

The answer to all those questions is NO!

When Thespo says Full-length plays, it simply means your play needs to be a minimum of 60 minutes and everyone involved should be 25 or under except fro the writer and the producer. When you register a full-length play, other than the duration, every other aspect of making the play is fluid. There are no restrictions in terms of number of cast members, interval, number of acts, etc.

This year at the festival, the selected full-length plays will get an opportunity to perform inside Prithvi Theatre.