I don't concur! With the first bit anyway, I don't think you need to build a specific deck, but largely those games do go on forever. At the Stoke SC last weekend an IG did make it through to the final (on timed wins/draw) and the game in the final took well over 45 minutes against Hayley with Deus Ex. I think it might have been just short of an hour, but don't have specific timings. I know I played three games of casual Netrunner in the mean time and it was over 45 mins... So it does potentially get you to a final in tournament play, but it's interminably slow.
I've not done so recently as it seems to have calmed down, but yes, for a while I put "no boring museum decks thanks" in the title of my game. That helped a lot.
There were a couple of museum decks at the SC this weekend, I think tenth place was the highest one got. My mate missed out on top 4 because he had a timed win one round - essentially the first game against IG had taken 50 minutes (which he won), not leaving enough time for him to win his Corp game.
I'm not invalidating anyone else saying they're playing quickly enough, but it is definitely a thing that the presence of these decks at tournaments is slowing games down. Online with casual play I'll happily walk out these days, as I've not got (personal preference) an hour to spend on hunt-the-agenda type games, when I can instead be playing more "classic" Netrunner.
Horses for courses.