I check every day. I used to do it out of worry and concern, but after months turned into years, I started adjusting to the small ups and downs (and the crazy roller coaster ups and downs) and overall, I am now desensitized to worrying over what happens to my portfolio. I usually just don't bother looking at all if it drops down anymore. Why bother? It either will continue and eventually I'll hit my time to check for rebalancing or it will recover.
If you can't step back and rationalize that losses will happen, you will eventually see heart-wrenching drops at some point, but that is okay and it is not something to get crazy over, then you do need to take a break from checking on it. Put a self imposed block on checking your portfolio if the market drops by X percent, or you are only allowed to look every month or quarter. Just leave it alone. Your eyeballs on the $ isn't going to help fix the market and panic should not be part of your investment strategy. The market will fix itself eventually all on its own, so adding stress or worry to your day or week isn't a great choice.
As long as you're following your asset allocation, investing smart (not gambling, likely using index funds) then you can stop paying attention for the whole year even. Just set up a reminder to go check for rebalancing at some point.