What's the hardest I can drive a MC-E on a first-generation L-Mini?

Fallingwater said:

I got a freebie L-Mini with a busted board; the LED still works, but I'm thinking of reworking the whole thing into something with POWER, and I just so happen to have a MC-E LED out of a DX module (which I took apart due to its inadequate heatsinking).
The driver isn't really a problem, but the heatsinking is; the L-Mini has decent heatsinking for a single-die LED, but it isn't meant to run a quad-die one at full power. What I need to know is how hard I can run the MC-E before I run the risk of frying it or drastically shortening its lifespan if I forget it on.

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Fallingwater said:

Continuously. I don't want to come back to a fried flashlight in case I forget it on.
A temp-controlled driver that ramps down from full power after a while would be good, but I'm trying to keep the mod on the cheap side and wouldn't know how to build such a driver myself.

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