Time restricted tournament strategy

[Doofus]

I deal and sometimes play in tournaments that aren't freezeouts but the top 2 or 3 chip leaders will advance to the final table after 1 hour or so. Blinds generally double every round or 10 mins, and the players are mostly of the loose donk variety. How should my strategy differ from normal SNG strategy?
Yes this is free pub poker, which has taken off in Oz. Prizes at the end of a period can range from a trip to WSOP or a car.