Mine usually all drains thru within an hour. No wort wasted. Mine is 200 micron or less. at least twice as tight as yours.So I gave it about an hour and a half and figured that was it. It's getting late and I do not want that wort sitting overnight.
How long did you let the kettle sit undisturbed before you opened the drain spigot?
And very important...how is your spigot set up? Is it a couple inches off the bottom? If you have a dip tube you need to get rid of that that. If you open the spigot too much, there is the chance that the velocity will start to pull up the debris that has fallen below the spigot.
Try it a few times and you will see what happens and how to make improvements.
If the screen starts to clog up too soon, then you didn't let the kettle sit quiet long enough. Just shut the spigot and let it drip thru, rinse the strainer and start over after letting the kettle sit a bit longer.
You do have a lid on the kettle? So don't worry about wild yeasties or whatever getting in.
And you should place a lid over the strainer while it's sitting and dripping. It will be fine like that for hours or overnight.
I use one of these for overnight filtering...3.5 gal bucket that I can put in my refrigerator and watch thru the translucent plastic. They are only a few dollars normally in the store. Not sure why online price is so high. But the short bucket I can get in my garage fridge.
https://www.walmart.com/ip/LEAKTITE-3GLWMN-3-1-2-Gallon-Watermelo-Pail-Multi/46651160?from=/search