1) Never ever ever ever ever ever ever ever stroke anywhere but the base for the first 4 hours. You're just deadening your nerves whereas shaft strokes actually help maintain the erection. This resets each time you redose btw.

2) Long, deliberate strokes

3) Hard up, soft downward

4) Make peace with the fact that you aren't going to orgasm much less satisfactorily before the 3 and likely 7 hour mark

5) Shift away from video content towards audio, written and imagination. This will both waste less time and provide alternative avenues of stimulantion that may be vastly more successful

6) Take breaks where you just sit/lay down with your eyes closed without touching your weewee. The Speed is gonna tell you you're wasting an orgasm that's just around the corner but it's a lie. Let yourself relax and dream and recover

7) Nothing in your house except your fingers or your roommate's penis are appropriate for sticking up your ass. Not that candle. Not that bottle. And absolutely not your girlfriend's dildo. At absolute worst you may consider a hairbrush with a wide end. It's questionable but infinitely Les questionable than any other option. Literally thousands of people get sent to the ER with random objects up their bum-bums. Don't become a statistic.

If it wasn't explicitly purchased for anal use it is almost certain to become a very painful and embarrassing end to your session

8) If you randomly get horny enough to consider hooking up with a stranger, don't. Barring that, advise them on the fact that you're incredibly high before the clothes come of as this runs into potential issues of performance, personal comfort and consent that your partner needs to be aware of.

9) Be sure to stretch and readjust your position a lot. Severe ligament sprain from zonked out fiddling can very much occur.

10) After you bust, sit down in a lukewarm shower to sober up and avoid reeking as much.

All the best.