Originally Posted by
Koyote
I remove the valve core and use the dipstick that comes with a bottle of Orange Seal. I do find it worthwhile to check regularly, as the refill intervals vary according to the weather, the number of punctures I've gotten (and often don't realize I've gotten, if the sealant works immediately), etc.
This ^^^
My gravel bike tends to get the most action. Mostly because I've been experimenting with different tires, but also because it gets a top-off before each event, which has been every 3-4 months. Now that I'm thinking about it, it's probably time to check my other bikes.