shortest time for an imperial stout?

I racked an imperial stout onto a porter American ale2 yeast cake. O.G. 1.078. I am doing primary only. I was wondering what is the shortest time I can bottle in. I usually let my beers go 2 weeks and then I bottle and i want to do this and probably will. I never take gravity readings until I start to bottle because I'm confident that they are done fermenting. However I am more worried about off flavors.

I might do a gravity reading for an imperial stout, especially if you are planning to bottle so soon. Are you planning on conditioning in the bottle? An imperial stout deserves a long conditioning phase.

I would definitely take gravity readings before AND after fermentation on an imperial beer. If you pitch a large amount of yeast, you may have less yeast in the bottle if you secondary and extend that for a few weeks, however, I don't see a problem bottling sooner if you really want to. You just may end up with more yeast in the bottle and therefore a greater chance at a less than clean flavor in the long run.

How big do you plan to make this beer?

It's O.G. is 1.078 already started it

So it barely fits the requirements for an imperial stout

I would go 3-4 weeks primary, especially if you are not checking gravity. I would probably cold crash to drop out as much of the yeast as possible. Should have no off flavors with less than 6 weeks in primary.

From my research before making my imperial stout, it's drinkable within 2-3 weeks in a bottle. The longer it sits the better it should taste.

Mine was in the primary for 2 weeks and 3 more weeks in secondary.

I plan on trying my first bottle one month from the time it got a cap on it. Then will wait 2 weeks to try again and then 2 more weeks to try again until it tastes like heaven.

I don't think you can really rush an imperial stout.

At that gravity it's not really going to need a lot of aging. And of course a lot of people don't mind a bit of alcohol hotness in their imperial stout. I wouldn't sweat it. Just do what you normally do.