Around 2-3 hours. Although my playtime is anywhere from 1-1.5 hours. 

I go as long as 2-3 hours without crashing...although I usually don't play that long, usually I play about 1-1.5 hours without issue.  

 

My game is heavily modded with CryENB, HD textures, various cop ped mods, police-police4 modded cars with ELS v8...all graphics maxed out, visual distance and vehicle density maxed also using Traffic Load.

 

I use both GTAIV and EFLC, although seems EFLC is more stable with LCPDFR.  

 

DrDetroit

 

sounds about right or until i get board i used to run it in mulitplayer to avoid crashes and it never crashed and that was multiplayer in my own lobbyt

I don't have the greatest specs, but when 1.0d came out, I just binged out and played for around 10hrs. But now it crashes every 2 to 3 hours...

I think the most I've managed is a couple of hours but then again I do have quite a few mods installed so I'm not suprised.

5 minutes. I swear to god.

I seem to get between 20-50 mins. One day on 0.95 though I managed one and a half hours, which shocked me!

Longest ever was 1 hour. But, usually 20-45 minutes average.

Probabley For Me About 1-3 Hours With Mods Vannila 4-6+

on 0.95 i can run for 1.5-3 hrs on any version of 1.0 crash at first call out

i can eek out about 2 hours nowadays. here lately i've come close to crashing but i think its either the callouts script i got or bravehearts script. i honestly don't have a clue but at least now it reboots. that is a big plus!

Until I tweaked my LCPDFR settings... 5 minutes. Since the tweak (with help from Lt Flash)..... Hours and hours and hours. No crashes since.

Until I quit. I rarely crash, and when I do, it's usually because I made a derp somewhere.

Why you guys are so lucky

One hour no more. Often crashes :(

It's interesting reading up on different people's experiences. When the hotfix for 1.0d was released I managed to play for a full hour with a pursuit or two without any crashes, pure luck I guess lol.