In my opinion you'd be better off using 3-4 days in a week but with days in between where you're clean, and then a week off. If part of your usage period contains daily dosing it'll get a lot harder to stick to, as it feels easier to justify extending a 3 day use period to 4 or 5 days than it does to use on an off day if you *always* leave at least a day in between. Like Lorne??? said, if you're having to plan your usage already that could be cause for concern - though if you're just new to opiates on the whole and are wanting to take extra harm reduction procedures to ensure you *don't* get addicted then that's a good thing. Just be aware that even the best routine can slip, and IMO you should instantly force yourself on a long break if even 1 day is out of line with whatever you schedule. Once again I recommend that you space your usage out with days in between, and then have a week break to drop your tolerance, otherwise tolerance will slowly raise and so will the frequency of your doses.
Lorne???, normally I agree with 99% of your posts but what are you on about with rectal Morphine? Rectal Morphine is waaaaaay better than oral. Seriously, it's the only ROA I'd consider personally other than IV. I have plenty of experience with oral, nasal, rectal and IV morphine. IV > rectal > nasal > oral in intensity, and oral ~= rectal > nasal > IV in duration. Morphine was the substance that convinced me plugging was worthwhile after all.
Nasal is pretty pointless since although the peak plasma concentration is hit faster and your 30mg snorted will feel better than 30mg oral initially, it wears off pretty fast in comparison, and you get more bang for your buck just eating it and not redosing. Rectal on the other hand is stronger than nasal, and lasts around the same as oral give or take half an hour or so. The difference isn't as noticeable with a lower tolerance where all ROAs are effective, but for example if you've been shooting Morphine a bunch and then try switch to another ROA, the difference really shows - when I was last shooting Morphine I'd actually feel the leftovers pretty nicely when plugged, but take them orally or snort them and I got nothing at all.
FWIW, oral BA is: 20-40%, rectal BA is: 36-71%. Duration about the same. I also find that the onset and time to peak is about the same, maybe it's a matter of debate because with any opiate use there's the issue of constipation and that interfering with plugging? I know plugged Morphine isn't that great if I haven't taken a shit in the last couple of days but otherwise it beats any ROA except IV for sure.
Oh one thing I will add, if you have pills with some kind of wax mechanism in them to stop them being IVed, you'll want to break the mechanism (whether it involves heating, a cold water extraction, etc depends on your specific brand of pills, look them up and look up the IV prep) if you decide to plug, otherwise they won't work at all, or barely at best. If you do that though plugging is worthwhile. I still consider it a decent ROA for Morphine even after having tried IV.