Hi, thank you
Short answer: 10 minutes (optionally + 10 minutes)
Long answer:
Hold The Line and Supremacy
They are about capturing points, default match duration is about 10 minutes and it prolongs with 3-5 minutes for every point attackers capture. In Supremacy you can capture in any order, in Hold The Line the order is given.
Boarding Action
1 neutral point, 15 minutes, no time adding.
Elimination
Here you kill, execute and finish enemies to fill a score bar before the enemy does, you have about 10 minutes, no time adding.
Duel (= deathmatch)
Several rounds, in each of them you win the round by eliminating enemy team and standing alive, whoever wins N rounds, wins the match.