I guess the runtime depends on what cell you use... Initially with all the quads I had them in surefire hosts running a single 18650 cell but later on I got my hands on a few Fivemega 26650 hosts... much larger capacity cell.... with one of those I would guess that the quad would go for an hour or so... mind you I would not use a DD quad with an IMR cell as it is not recommended.... OK for a few minutes to take a picture but thats it.... you need a protected AW cell for that one. The two quad manufacturers are Jesse (VanIsleDSM) and Kenji .....
I run these (second from the left and the one on the right ) with the quads but I also have cryos cooling bezels now.
The one second from the right is a FM 32650 host but currently I have a D36 XML drop in that one as there are no D36 quads...
The long one had a moddo neutral triple in it with 2 x 26650 cells...... a very nice light with a long runtime due to the two cells
Mind you I am still waiting for this
http://www.candlepowerforums.com/vb...3115-Lumen-Thread-On-for-6P-and-FM26XXX-hosts.
in a multi mode configuration.... I have had an empty host sitting on my shelf for months.
If you like mags then I do recommend the Mac custom.... 3300 lumens... also reasonable hand warmer in the colder months! Again two cells ..... I have never really run mine on full for more than about 20 minutes as that is how long it takes me to walk my dog around the block!
http://www.candlepowerforums.com/vb/showthread.php?288560-Mag-3300L