One interesting way of masturbating I recently discovered is this:
Put a raincoat hood over your head, and wank in your favorite way. It will be pitch dark, and you'll be able to concentrate much better on the sensations you generate. It makes your face and head all sweaty, hot and steamy. You can hear yoruself breathe and pant up close. And the mild lack of oxygen is stimulating. I also found I had powerful and spontaneous visions of herds of horses etc., very touching.
Time flies when you're having fun, and, upon cumming, I found I'd spent over an hour wanking non-stop. Give it a try.