I just referred to a post I had bookmarked where a breeder was sharing that his female spent 10 weeks gravid and Gecko guru, Marcia, replied that she had one go 12 weeks. 24 days is not too bad...relatively speaking. I have found that females that go off food when gravid seem to take longer between clutches. I don't think you should be concerned at this stage, make sure you have a moist laying site, the absence of one can lead to dystocia (egg binding).