Croke Park - GA or Hogan stand seats

[sweetie]

Hi all,
I'm about to book a pkg with a tour operator and my choice is either GA or Hogan Stand seats.

I'm wondering how much time I would need to allow to stand in the GA line to avoid getting stuck in the back of such a large field.
The tour company has a few excursions planned during our time there and one happens the morning of the concert. So if I book GA tix I may get stuck getting to the concert too late in the eve to get a decent spot. But I could be missing out on a great party on the floor.

Any thoughts? Thanks for your help.