The biggest concern is total time of the event. When you are at a show or renting a hall you are limited to the time allotted by the venue. For example the Gencon finals will be a 24 person 5 round Swiss we have 6 hours to work with including deck reg.
How long should the rounds be?
I think a 90 min model is needed per game to deal with top end, but include time limits during plans. Honestly if you condition players that: ok guys, this game can take a while and to respect a full game and not have ppl turtle the tie condition then at this level of play (the top tier, tier 1) then you have X time in planning (my suggestion is 60seconds) to get your 2 cards and be ready.
Yes, that's not casual friendly, but a tier 1 tournament isn't meant to be casual tournament.
Also that above is the stick ( of a carrot and stick methodology) let's also like in soccer, i believe, do this: wins = 4pts, ties = 1pt and losses = 0. Why? To encourage playing to win. If ties are so common make them negligible, and make wins so good that 2 wins in a 5 thing swice will get you to next day. And don't make losses super bad such that ppl will want to prevent a loss and not risk a loss to get a win. Scenario: hmm I'm almost out of time I
4 ties and in this game if I get a win I'll almost surely get to the next day, I'll be aggresive and go for that win, and so might my opponent. This will encourage ppl to play fast because they want wins so that they can advance.
Thoughts shadow?