how far do you say jeff and vinny are in their endurance run percent wise im guessing

Percent Wise? Not that far really. 15%ish

Only the second dungeon, quite a few more!

"how far do you say jeff and vinny are in their endurance run percent wise im guessing

because im tempted to pick this game up  because of their endurance run but if they are say 35-45% done  ill just stick along for the ride then"

35-45%?....they're maybe 10-12% done if that just going by days past, which there is far more to the game than that also. If someone was going at a decent pace through the game at their point there would still be a minimum(as in getting a bad ending and cutting it shorter than getting the good/true)  of probably 50-55+ more hours. At least 60-65+ for good/true ending, but thats still going through it faster than most do, or you would want to for that fact.

they are gonna have to do some sort of live stream and knock a good chunk of that game down

I was at 105 but that included some time leaving it run because I was going to be right back and then its 3 hours later.  I also tend to listen to most of the voice acting.  To put in perspective, there are 8 dungeons in the game, the first 6 you run through twice.  They are at the end of the 1st run of the second dungeon.

90 hours on my first playthrough.  Then my memory card got corrupted and deleted everything, so I'm doing it over again.  46 hours in, at the second-to-last-dungeon.

They are also going much slower cause they are doing commentary while they play; so they often pause for 30 seconds to laugh and stuff all of that adds up over time. When I started my playthough I caught up to them at like 12 hours when they were already 19 or so in. You can easily catch up to them in a weekend if you put in some good time as you already know what is happening in the game.

And ya they really need to make backups of their saves or something, cause I know they are going to get corrupt data eventually...i've never lost anything yet but have had scares of "data cannot be loaded" or "memory card not found" on my PS3 so I started to back up to my PSPs Pro Duo card after a night of playing.

I expect first run through for me to be like 70 hours and then after if i play again i'll do all the 50 side quests, i've done a few but really didn't even think about em and don't really wanna go back to say Yukiko's castle and such; heck can't even find the guy that wanted the Demon Statue anymore as its the 2nd term of school for me now.