Can you guess what strain is this pot? And how can I tell when it is ready?

Looks like a Mexican Sativa. Probably needs another 3 or 4 weeks.

Why Mexican?

I grew out a few seeds from dirty weed when I was a kid and they looked very similar. Took forever to get close.

Its definitely "a" sativa strain. The giveaways are the long fingerlike leaves and the long tall thin branches

Is it Mexican? I don't know if there is any well to know that for sure from just a picture.

On the other hand, since the vast majority of the seeded commerical weed seen in the USA is from Mexico, and since serious imports of other sativas stopped decades ago, that really is the most likely strain.

Chance of this being a commercially available Sativa strain that your friend germinated then gave you is pretty negligible.

Anyway pure Sativa strains take a LONG time to finish flowering; in some cases 3-4 full months, and they also tend to give looser buds, which is why they're usually not favored for growing in the USA.

How do you know what its done? Same as any other plant: Look for most of pistils (hairs) to turn brown, calyxes (false seed pods) to swell, upper fan leaves to start to turn yellow, and for the trichomes on the upper buds and leaves to turn from clear to cloudy, then amber. You may need magnification to see this color change.

when you think its ready chop a small bud from halfway down, speed dry it and smoke it, remember it will be a bit rough and wont be totally like well dried or cured weed but it should give u an idea. id say at least two week minimum but maybe 3 or 4.

Okay thanks guys, it really helped!!

How do you SPEED DRY??

put some nugs in a cigar box for three or four days, and hope its dry enough to taste. not the right way to dry, but if you really really want an early sample..