Bertie I'm going through the same thing. I had surgery 7 weeks ago and return to work in 2. The answer to your question is, unsurprisingly, it depends. It depends on the number of grafts you get, how much existing hair you have and therefore whether concealers will be useful. Your skin type, how quickly you heal, the surgeon etc etc.
You really need to post a pic to be able to get more specific opinions/ suggestions as to how you will look and ways you could cover it up.
On the plus side SMG post ops always really impress me. Very neat with minimal trauma to the recipient.... needless to say, an excellent starting point.