I have been thinking on this for a bit, and I wondered wot the rest of u guys think about it ?
We have all heard of "changing gears" so to speak , and I reckon a lot of
this depends on the format , (excluding when we get down to one table)
for instance consider in my pc poker game , the difference btn
9 hands per level and 60 hands per level ( 15mins per level vs 90mins per level ) in the shorter version there will be much more aggression won't there?
The "value" of the hands change yet again then , even 10 handed...
an example in the shorter version I would play A9 out of position,
in the longer version I will probably and simply fold A9 suited in position...
thoughts ?

This difference is most highly represented in turbo MTTs vs non turbo MTTs, what you say is correct but the difference is very slight. You need to shove your 6bbs in lighter when you know it will only be 4.5bbs next orbit and you wont have fold equity, this is the main change, but overall needing to play looser preflop to chip up earlier is also valid.