Missions with time restrictions can be stretched by adding additional threat level. ( 1 round extended = x1 the new round # is the threat issued i.e if they go to round 6 the imperial player get 6 extra threat, 2 rounds extended = 2 times the new round # is the threat issued i.e. if they go to round 7 the imperial player get 14 extra threat, etc.)This allows the mission to go longer, but the longer they take the more the imperial player can redeploy.