I am wrapping up an Apiguard treatment. How do I know if it was enough?

I got busy during the first 2-week dose and did not check the tray under the SBB. After 2 weeks, it was wall to wall mite carcasses. ugh. Put on 2nd dose of Apiguard, and mite drop looked good for a while, then (got busy again) after a week, another tray chock full of mite bodies. Sheesh!

If the infestation is this bad, will this colony survive? Has the Apiguard knocked them down, or are there still thousands more in there? I have observed a few DWV bees, not a lot. Have not opened for a full inspection yet. When I do (later this week, if the rain stops), what should I be looking for?