I change my site every 5-6 days! (Meaning that I put it in on Friday and I will change it on Wednesday or Thursday).
At one point, I checked how long I could go without changing, and I have found that my sites are just as effective until day 5-6. I have left it in until day 8 (but I usually end up pretty high because of poor insulin absorption after day 6).
I don’t particularly like changing my sites and they are expensive, so this motivated me (with the reluctant permission of my doctor to see what the limit is). For some people, their skin would be infected if they waited this long, but I have not had problems. But perhaps I am more polka dotted than the average pumper!?!-- as the red dots take a couple months to disappear, but it works for me! I say try leaving it in 3 days, then 4 days, … and see if you have reduced insulin absorption (i.e. unexplained highs) or skin problems!
In the long run, this might not be a good idea ( I welcome criticism!), if I will lose absorption in my favorite site areas, but I rotate as much as possible between my stomach and buttocks, and lovehandles and after 3.5 years of pumping, no problems.
Hope that you are getting used to and enjoying the pump!