Guild Wars 2

Today my guild did Langmar Estate Guild Puzzle.
Arriving at the puzzle the timer was 8 minutes, checking a different map gave us a timer of 12 minutes.

With 6 minutes on the clock we decided to go for it, we entered with 30+ and finished it with 20 seconds left on the clock.

However, this wasn’t a good thing for us.
We had a few players who were a tiny bit behind, which made they didn’t get their rewards. So 25+ got rewards, and 5 players got locked out.

Why can’t we get instanced Missions? (Puzzle should be very possible, rushes are harder in that context I agree)

We had 2 choices, either wait 6-8 minutes (wasted time) or go in (which didn’t turn out great and we had to do another).

Why can’t we get a Guild timer or something
(Timer/Counter that only works for your guild, no matter if another one is already active)

EDIT:
Yes, we got the message to accept/decline (Which someone accidently accepted instead declined)

I’d have waited the 8 minutes and started fresh, to be honest. You didn’t have to jump right in and rush. Once it ends the timer has to start again and you get the full time.

I can understand why people want instances, but in this case, you could have just waited and got credit for everyone.

I am sure just waiting those 8 minutes would have saved you 10.
I think a nice function would be when the guild mission is over you can close it manually.