Here's my 2CE rectal story...
I plugged 6mg, then 30mins later plugged another 3mg (I was coming up on the 6mg but not fully there). Then at T+55mins I plugged another 3mgs. At T+45 I felt like I was almost fully up on the 6mg and coming up on the second one (I could definitely feel the individual doses come on when they did).
By T+2 hours I was peaking and this lasted for 2.5 hours. I slowly came down and by T+6.5 hours I was down almost completely (though my eyes were still very dilated). I then went and played in the snow.
It was MUCH stronger than 17mg oral (all at once), but did not feel threatening at any time. I finally got to see the deal about the unique 2CE visuals (which are actually a lot like 2CB but seem somehow deeper and more emotional). Music was amazing!!! (classic situation - the lyrics were being sung to ME while I was snuggled under a pile of blankets!).
I also fell in love with myself in front of a mirror (that was such a beautiful person staring back at me!).
Next experiment will be with two doses staggered 30mins apart 7mg +5mg (or possibly mix it with 2CB).
Here's the interesting part...rectal 2CE takes MUCH longer to come up than rectal 2CB (and from what Ive gathered 2CD and 2CC). The comeup was VERY gentle but MUCH more fun than oral. I was having fun and tripping pretty hard by 45mins-1 hour while orally I would not even be feeling the chem.
If you are planning to plug 2CE you must realize it might take up to an hour to peak (not like I thought 15-25mins like 2CC and 2CB).
I have no idea what staggering the dose does to the intensity, so I cannot give an estimate how much it is potentiated. Staggered like I did, I wager it is not quite twice as strong (perhaps on the order of 175% as strong). It felt like what I guess 19-21mg oral to feel like.
The moral of the story is its a great way to dose 2CE if you maintain some caution. You CAN titrate your original dosage 30-45mins after you've admin'd but you MUST realize you will still continue to gain intensity from the original (so the supplement must take this into account).
All around summarization:
clean, cool, smooth, beautiful, euphoric chemical headspace.