Shelf Life of Methylcyclopentadiene

We are making organometallics in the lab, but instead of just regular Cyclopentadiene dimer, we crack methylcyclopentadiene dimer to make methylcyclopentadiene.


I cannot find the shelf life of methylcyclopentadiene, because we are going to be using a lot, and it takes quite a bit of time to make, and we need to make some in advance. 


Does anyone happen to know the shelf life of methycyclopentadiene?


Thanks!


