if you run s4 at 50 mg per day, then it will last 30 days.. often times, people will increase their dosage after being on a few weeks but thats entirely up to you...
lgd would be one month per bottle
mk2866 would be two months per bottle...
these are 12 week cycles...
here is a link to the sarmsx discount page...
https://www.sarmsx.com/30-off