Fastest finishing Sativa or Sativa Mix

What is the fastest finishing sativa or indica/sativa mix, with a nice cerebral smoke?

i hear that JTR by TGA seeds is an 8-9 week sativa.
i dont know how nice it is, subcool himself will tell you its potent shit

i'm working with jtr right now. they're 6 weekes old 1 female,1 male. should have some clones in a month or so. the 8 week finish time would be great if thats the pheno i got! also that fact that its off jacks cleaner really sold me. jc is in my top 5 of all time