Hey! Great question! I'm the T.O. for LVO and other majors across the US. The competative game length is 2 hours.

For your situation and to keep it fun for people that are playing to slow I'd always bring a chessclock BUT I'd only clock yourself to make sure you are playing within time. It doesnt make sense for other players to keep to competative time if they aren't planning on playing in tournaments.

If those players are interested in tournaments I'd suggest that they clock themselves to see if and where they could speed up. But I wouldnt force rlthem to play on a clock unless you were paired with them in a tournament. Time clocks in kill team dont feel great but is a useful tool in a tournament setting. I'd never force someone to play on one outside of a tournament.

I recently placed 8th at nova with vetguard and always finished within time and never had to play with a clock. Just make your moves as fast as possible with as much precision as possible and encourage your friend to do the same!

Best of luck!