I usually log the earthcache with the date when I visited the place. At that time I was able to examine them, perform tasks, etc. Mostly the same day, but sometimes it happens that next, I edit the answer and send to the author. Regardless of whether I send them on the same day or another, I log on the earthcache the day I visited it and always after sending the reply to the author, and I put this information in the log (either for myself or for more interesting players;)) .
For example (https://coord.info/GLTD9PVT):
This is my geocache number 1126, which I visited at 2017-10-15 at 14:50. Replies sent on 2017-10-16 at 14:15, log: 2017-10-16, 14:17