I had a GM who had prepared brilliantly (3D maps etc...) and was playing with a decent spread of PC's (11,9,9,8,7) all who had played together previously and are experienced PFS players.
We ran to about 7.5 hours; which is appropriate for finale but could be very tight for a Con. A party of PC's prepared, coordinated and supporting each other should may get that time down but don't bank on it allow for time to run over.
The issue is a lot of high-level play and effects to consider; When I run this a GM I will be putting in extra time in on the books and putting together reference tables, and stats beforehand.
I really enjoyed playing this one; when playing advise your PC's to play smart (avoid the meatagame of course) but if they make a sensible suggestion - go with it - our party completed this scenario because we cooperated and listened to each other over the 7.5 hours.
I am a bit apprehensive about running it myself but I will be recommending allowance for extra time because it's time well spent
I will come back with an EDIT to this review after running it.
I ran this for Free RPG day in Sydney, A table of first-timers for PFS (but experienced 3rd Edition players).
Everyone at the table played a pregen; 5 of the existing 4th level iconic and 1 played a 3rd Level Quinn.
I gave the table a warning before starting the session as the initial encounter worried me but they worked together as a team and it was fine but challenging.
As a GM note the scale of the Pyramid as each square on the map is 10ft (the scale really works for the adventure).
The day finished with 9 new signups to the society including people signing up on their phones at the table as I was writing up the chronicle sheets.
EDIT: I found out that you had to play 3rd Level Pregens only, I allowed the 4th level pregens as the mod was 2-4 and the balance worked out fine. Could have been tricky otherwise as the skill synergies didn't quite work on the 3rd level pregens (there was no way to identify items etc..), Everyone still had fun.