I check almost daily. We track our expenses manually in Google Sheets (which I honestly enjoy), so I log in and update any transactions since the last time I logged in. We're also in the process of buying a lot of things (house, solar panels, tractor, water heater, etc), so I'm making sure I've moved enough money from Ally savings to our checking account to pay for things as they come up.
Also I just like looking :) Other than the crazy few months of buying things, we're definitely in an accumulation phase, and I enjoy seeing how things grow over time, even with the variations of the market.