I played Crypt about a month ago with several experienced players. We started around 6:30 and finished about midnight. A balanced party with reasonable equipment to deal with contingincies helped. (multiple weapon types, some holy water, and some alchemical splash weapons)
Experienced probably being the keyword here...teaching the game while not rushing the encounters might prolong the module considerably...
The module Risen from the Sands is also a good choice for an introduction to the game. The adventure states that it's written for four 3rd-level characters, but a couple of the encounters can be tough for that level.
Thank you, but I feel like most third level characters already present more options than your average "Completely new to RPGs" player could handle. I might give too little credit here, but I don't want to throw too much at once at them.(I haven't decided yet if we're creating characters together or if I create them for them. If I do the latter level 3 might be an option.)