I check our Fidelity accounts every few days. Actually, I check all the accounts every few days, but it's the Fidelity accounts that really bring a smile to my face, or a tear to my eye.
In all honesty, we're passive investors, and just let the money ride. I think of market investing as the Model A way to make money.
Wrote a post about it a while back: http://www.moneyisnottaboo.com/2016/11/19/investing-the-model-a-way/
I'm not one to look for quick money unless I know it's a sound decision.
On another note, I calculate our Net Worth every few months.