Alright, since you said that the reason you do the mock exam is to pace yourself, then it is fine. But I think you shouldn't spend the time to pace yourself at this point because the most important thing is to get the questions right first. Once you have made the improvement, then you go back to attempt the mock exam to pace yourself. The reason is simple, if you don't get the questions right, is the timing still important? And as you practice and make the improvement, you will be able to complete the questions faster, so there is no need to pace yourself at this point. The only time when you can pace yourself is 2 weeks before you take the actual test.
I don't know about
e-gmat, but I think you can check it out online to see what people said.
When I studied for GMAT, people said on an average, each candidate spent 100-200 hours in total to prepare the exam. But in my case, I would say I have easily spent more than 1000 hours on GMAT. I have attempted about 2000 math questions at least including get to know the correct answering approach to those wrong questions.
I would said that don't waste time on doing easy questions, just go ahead with medium to difficult questions. The average time to spend on a question is total time / total question.
There is no easy way out. Most people spend 100 - 200 hours on GMAT, but may be I am a less competent student, that's why I spent more than 1000 hour on GMAT. But it doesn't matter. Just keep trying until you succeed.