4 - 5 minutes?! Maybe for a plank variation, but definitely not for an L-sit and definitely not for a V-sit - assuming you are talking about the gymnastics variations. Holding it for that time total is impressive enough, much less doing it in one go.
Good work! What schools you looking at? Squatted for the first time in about 2 weeks last night. My legs and knees were really achy for a while, so I think the break did good. Took it easy with 225 and it felt great. Going to start loading back up. Hoping to push my squat and DL back over 300 by end of August.