Grand Theft Auto: Liberty City Stories Tips

Unlimited time for firetruck etc...
Wait until the timer is at 1 and about to switch to 0 and put out the fire, Deliver the passanger, Drop off everyone at the hospital or whatever you may have to do. The clock will dissappear and you can carry on doing the missions with ease!

Warning: This is very very hard to get as you have to get it EXACTLY as it changes.