Time is rather an intangible concept, a second can be an eternity, years can fly by in the blink of an eye ;)

Of course with some trial and error you can fake it by just adjusting the exposure settings in photoshop, saving out three images and then merging to HDR. But this won't work for everything and is a little sloppy.

I'm just setting up a render for proof of concept using the three render techniques. Give me a minute ;)