Personally, it was lots of heavy for me, until somewhere around week 2. I would go through quite a few of these though. I found that the first 2 weeks were the roughest. Then it went to mediums for about 2 more weeks and I noticed I could last a bit longer without a wash. Now i'm 5 weeks PP and am currently on lights. GL!
I was wondering this, too!
On a side note, I was recently told that massaging a small amount of castor oil on your belly PP can seriously help your uterus heal and decrease bleeding time!