OK, so magic lantern allows recording to restart automatically once a clip reaches its max and stops. However, how long could you let it run like that? How does the T2i do as far as overheating? If I wanted to have one shooting a continuous wide shot during a wedding unattended could I do that without the camera shutting down? I am aware that I lose a couple of seconds between recordings.

I haven't done any rigorous testing to confirm this, but I believe the overheating problem is reduced when a battery grip is used. My T2i used to overheat fairly frequently until I got a grip, and it hasn't overheated since.

Yea, you can use a battery grip, but you can also turn the bit rate down and turn the lcd screen off during recording. These are things that I have found to help out with overheating. Since it will be unmanned, there is no need to have the lcd run during recording. Every time I do this, this will almost certainly make sure that it doesn't overheat. These are both options you can achieve with magic lantern!

Thank you very much for the responses. A battery grip would probably be a good idea anyway if I am going to attempt that type of shooting.

Similar to turning off lcd. I found that using a monitor also helped with the overheating.

I use a 550d/t2i with the 11-16 tokina as a c cam at almost all af my weddings ( wide cam on rear balcony)

Using magic lantern, battery grip and a 32gb card (class 10, in my tests class 6 cards had issues)

The memory card fills up before the battery(s) run out, and that's without any power saving options from magic lantern. ( which is about 90 mins worth of 12 minute clips )

Done this for about 50 weddings , never had any issues (touch wood)

I also use loads of the other features that magic lantern provide, magic zoom, WB Kelvin to name 2.

battery grips, on-board, LCD off, monitor over HDMI (on main camera), and i have never had an overheat warning. Sandisk 8/16GB Class 10.

Battery grip +1. It increases the time before T2i got overheated. Also, good for doubling the run time. Also turning off the LCD screen does have an impact too. I put together some test on T2i to see how long it started to show the overheat icon.

Canon T2i Overheat Test | L.A. Color Blog (http://lacoloronline.com/blog/?10126-Canon-T2i-Overheat-Test)

Another time I was handholding the camera and it seemed to overheat very quickly. Must be my hot hands.

I feel like an idiot. I cannot figure out how to turn off the LCD screen during recording. Is this an option in Magic Lantern? I am not seeing an option for it. I will keep looking, but if someone could enlighten me, it would be much appreciated.

EDIT: Never mind just figured it out.