My doctor said the more sitz baths the better -- but my incisions were not nearly that long. Mine where in the perineum and the size of small-ish ice cream scoops. I would definitely ask your doctor how many you can take. I found them to be soothing. Also, make sure you time your pain meds so you are at maxiumun effect when you get in the tub. For me, percoset is in full force after about 45 minutes.
I know this is horrible!! I really feel for you!! But please, please remember that every second, every minute, every day that goes by, you are getting closer and closer to being healed! Yea!!! You have dealt these miserable abscesses for so long and soon they will be gone!! So be encouraged!