I saw an increase in a couple of days.
But as mentioned, it may alos happen so fast you may not even see it. It will raise, but enough cured lr, coudl restabilize iself in almost no time at all. Which does not mean it did not happen, it only means you did not notice it.
If it goes a week(in your case), without you seeing any climb, then I would think it is safe to proceed(shrimp will raise it fairly fast) but the amount of bacteria(lots of cured lr) you may already have, might even blast it back down twice as fast too.
In any case, you casnnot force or prevent a cycle, IMO they do happen in every tank. The question is how long(hours MAY be posible, but weeks are also more possible)