Hi,
I'm 7 months down the line. I'm currently signed off from work for this very reason (maternity leave ended when baby was 5 months). My scar is huge - clearly visable, it is an extended episiotomy. It goes on to my bum cheek!!!!
I think it seems different for everyone - I've talked to many people along the way. It depends on the issues really. Mine is so huge, that there is a lot of scar tissue. Inside is still not fully healed, and is raw in places. There is granulated tissue too.
It's been long, and slow. But things are definitely a lot better than they were even at 4 months down the line. I am still uncomfortable walking, lifting, bending (crouching is just a total no go) etc.
I had to fight and argue my way through things. I went back to the GP at 4 weeks PN, and was then referred to gynae - which saw me at I think it was 8 weeks PN. Told to 'give it time'. Discharged. Wasn't happy with this so asked GP to re-refer as wanted a consultants opinion. Saw consultant at 15 weeks. She said 'give it time' arrrrghhhhhhhh. But prescribed amitriptyline for the pain, and vaginal dilators (as it felt like everything was too tight and pulling inside). I saw physio too, but not sure how helpful that was either. 
I then got to the point where my maternity leave ended, so went back to the GP and got signed off, as clearly I am not fit to work yet if I can't sit on a chair completely comfortably!. I asked my work if they could refer me to one of my colleagues, as I am a HCP. I was seen when baby was 5.5 months by one of the obs & gynae consultants where I work. I was offered a steroid injection treatment in to the epis site to try and break down the scar tissue and aid healing. I had that done yesterday (so too soon to say if it has helped). However she also said that now 7 months down the line, if things are still this way, it may need refashioning.
I have asked and asked til I am blue in the face if this would need refashioning. I've been told no - it will make it worse.
Now finally, it has been suggested.
I'm rather frustrated with the whole thing in case you couldn't tell!. One thing I can say is just don't ignore it, keep going back, get a second opinion etc.
I hope yours heals quicker. A colleague of mine went through similar, but hers was much better around 16-18 weeks. A few other people I've spoken to have varied anything from 4 months to 2 years. :( I hope I'm not one of the 2 year ones!!!