Maybe you can nuke it at lunchtime? Its perfect if its 95 to 97 degrees but anything from 90 to 100 is a pass.
I would still test yourself to see how long it takes you to get clean.Its good to know just in case subbing isn't an option. I would you own urine if your 100% positive it will pass but if you have any doubt use the QF.
On the test strips if you can see a faint line its a pass. The thc line will be a lot fainter than the control line.Those look like the same strips I buy.
If you have a dollar store in the area they carry some heating pads that work faster than the one that comes with the QF. I can get my bottle from room temp to 96 degrees an about 10 minutes. The QF one is a lot slower. I would experiment with your bottle,nuke it put it in your crotch and see how long it stays at temp. Then you should be able to figure out the timing if you need the heat pad.