In addition to what other people said here about this, it can be worth the $20-$30 to pick up a couple of third-party watch chargers and put them in your house where you can grab a quick 10-15 minutes of charging a couple times a day. For example, you can put one in the bathroom and one in the kitchen, so when you jump in the shower you get some charge, and if you're cooking / eating / doing the dishes you can grab some more charge – this should keep the watch charged for a virtually infinite time, with pretty low friction in your life...
^^^^^Yeah That^^^^^
We have 3 (bathroom, bedroom, work desk) for this very reason, and then one permanently in my suitcase.