WOW! You are doing it more than once a day?? Whew, that's more than enough for me generally! I am happy with once a day. Before though it was like once a week I was happy. LOL! I took an OPK and it didn't seem as dark as the one last night. I'll probably do another one tonight. Then I'll have 3 left. I'll use one tomorrow night after work. When it dried though, it looks about as dark as last night. I don't know for sure because after a couple minutes I got busy cleaning and organizing and just looked at it again.