I guess I was just unclear on how long it takes them in the bucket to... kick the bucket, so to speak.
Specifically, I was surprised that there were no survivors after one night, thinking those little buggers are hardy creatures who would keep swimming for... well, I don't know how long, but long enough that if you checked in the morning, you wouldn't necessarily find nothing but corpses.
I think some people add poison to the water to make a quicker death?
The method does seem effective, but less than ideal in terms of offering as close to a quick, painless death as possible.
I live in a rural enough area that an intruder or two every fall usually manage to sneak in. But, luckily, no infestations. In fact, the tip to get rid of any tiny openings is a good one. Since my spouse found a possible place these sneaks were getting in and patched it up, we had no intruders at all last fall. We keep loaded traps on a few strategic place, just in case.