I finished writing my novel months ago. I am in the process of editing my manuscript again. I must be into double figures.
Are you as obsessed as I am with your editing? I believe I am putting as much effort into editing as I did writing my novel. I find editing enjoyable, but hard work.
I have 2 friends who critique my work once I've finished writing it. I then re look at it and edit again but I get to a stage where I can no longer read it - I have to put it down and do something else, as I confuse myself with what I've just read and what I have written/read on previous occasions (that may not make sense but I know what I mean ;-) ) Editing it dozens of times is not something I feel I could do unless I put it down for a year each time and forgot what I'd initially written.
I am going over my manuscript with a fine tooth comb; and it is nearly three hundred pages. The right coma in the right place and the right semi-colon can alter my manuscript significantly. And they may not come to my notice for many reads. So my advice is edit the manuscript till you notice an error-free piece of work.
There are parts of my series that have been rewritten as much as seven times and then endlessly edited after that. I could keep tinkering with it forever but I'm going to call a halt at the end of this summer... I think.