if it takes a week for your pot to dry out then it would be around the 2 weeks, is there anyway you could raise the temp where the plant is? reason i ask is it will help dry the soil out quicker in return allowing you to water sooner, i have to say though your plant does look healthy. this is what i would try doing, raise the temps a few degrees if possible and maybe water in say 3 days time, i would then add the lime to my water and give her a good soak to get run off and keep checking the ph levels over the next week, i had to do this on my first grow as well it really is a pain in the ass but you will get there. i hope this helps in some way