Quote Originally Posted by WrensMom
Yeah, she uses these Continental tubes of some sort that have a removeable valve core, even though they are presta. I don't know about the drying out time frame and all. These kind of details are kind of what I was hoping someone here might be able to fill in for me.
I haven't been using stans very long, but it seems like it needs changing every 3 months with 1.5 scoops of stans. When I've used less stans (less than a scoop) it barely lasted for 2 months. So it is going to vary.

You can check on your sealant by physically shaking your tire, and if there is a sloshing sound then you are good to go. It is very easy to clean out a tubeless tire and/or add more stans. You don't have to take the tire off the wheel....just deflate it and only take the tire partially off the rim (just enough to add a scoop and some H20). It is ideal to have another person help you do this.... Then you need to put the tire in place and used compressed air to "seat" the tire (like I described above).