I have several strains/phenos that finish in 49-53 days from flip in my environment. The best commercial seed recommendation out of them is Blue Pyramid by Pyramid Seeds. I've had two phenos from two different packs (purchased 2 years apart), both finished around the 7 week mark from flip. No regs, fems only, careful they also have an auto version. I ran 3 seeds per batch and found a decent keeper both times. Very nice tasting smoke, mostly indica so a little heavy, night time smoke. Another commercial strain that's more potent but I think I got lucky with was some Columbian Gold, grabbed a purple pheno that finishes in 49-52 days from flip, this is from World of Seeds (reg, they have fems but if regs are an option I go with the regs). I have a CBD cross of my Blue Ripper x Harlequin I call Blue Harley that consistently finishes in 50-52 days. All are fire and anyone I share them with comes back asking for more.
Blue Pyramid, 49 day harvest:
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Columbian Gold, 51 day harvest:
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I crossed the Blue Pyramid with my own Blue Ripper male and the first tester finished in 49 days, heavier head stone, less body stone than the BP:
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