It's a back and forth debate and you will probably get opinions on both sides. But if it's properly sealed it should keep for at least a little bit. But if not sealed it will go bad quickly.

 

Ok,for Oxygenated fuels,such as U4&MR9;once you crack the 5 gallon pail it's only good for a day or two.It's not recommended to keep it in your tank either as it's highly corrosive.
It's a good idea to drain yer tank a.s.a.p. when your done riding it.

As far as C12,C16 and other leaded race fuels that are non-oxygenated etc go,as long as you keep it in a container that's impervious to U.V. rays it lasts a couple months.

It's definitely a good practice to spray some WD40 down your intake ports and crank the engine over a few times.If you don't your bores will rust VERY quickly if you don't run the bike.....
Trust me,I ignored this advice from a very well known engine builder&found out the hard way.Read:$$$$$$$$$

 

Ok,for Oxygenated fuels,such as U4&MR9;once you crack the 5 gallon pail it's only good for a day or two.It's not recommended to keep it in your tank either as it's highly corrosive.
It's a good idea to drain yer tank a.s.a.p. when your done riding it.

As far as C12,C16 and other leaded race fuels that are non-oxygenated etc go,as long as you keep it in a container that's impervious to U.V. rays it lasts a couple months.

It's definitely a good practice to spray some WD40 down your intake ports and crank the engine over a few times.If you don't your bores will rust VERY quickly if you don't run the bike.....
Trust me,I ignored this advice from a very well known engine builder&found out the hard way.Read:$$$$$$$$$

OH SHIT !!!!!!!!!! I got some work to do. Stuffs been in there since Sunday afternoon

 

Bro,get that shit outta the tank man