That was July 9th, 2019.
On July 14th, 2020, one of the bees (possibly the only one) that spent the winter in its drill hole in our masonry, sealed in by its mother, with a locked, leafy door, emerged.
I admit I didn't see it emerge - but I did notice the hole it had made on emerging.
370 (full) days it had been in that hole.
As an egg. And a larva. And finally emerged as an adult.