Hey, at a little past 4 weeks since surgery I'm willing to call it a success so far. For whatever reason today has been the only significant pain following a BM since the second or third day...and it's not nearly up to the pain during the fissure days. My doc told me last week that I had some granulation tissue happening at the incision but that both it and the fissure were healing as expected. He didn't seem worried about the granulation and said we'd deal with it at the next appointment if it was still there. I'm assuming that's the source of the current irritation.
As for your work situation, I never told my boss or anyone at the company what my actual ailment was...and no one asked. The only person I told in the process was from the firm that administers our disability/leave policies. This is your issue to deal with and you're not obligated to tell anyone any more than what you want. Let them spend their time speculating if that's what you want...or make up a story to have them gossip about. And don't be embarrassed...everyone you will need to tell has heard it all before, especially the docs/hospital/pharmacy/etc.
Re: Recovery...I had my surgery on a Friday and took the following week off. Going back to the office was no problem at that point. I think the literature I got from my doc said 4-6 weeks for the fissure to heal and 6-8 weeks for the incision site.