yes. You don't really have to be that exact though. It is ok if you put them in lockdown a bit early or even a few hours or a day late. I normally stop turning mine on day 17 and up humidity on day 18. Most times I set my eggs mid day but I like to candle before lockdown so will do that the night of day 17 (so technically around day 17.5) then wait and sometime on day 18 I add more water to bump humidity. I have set eggs a couple days after others so waited till day 18 to stop turning and bump humidity on day 19.So that is in a few hours when I put them on lockdown then, correct?