That's about what how long I put in to it too, did it for about 3 weeks about a month after I started vaping. I still have 50ml of 50mg PG in my fridge. I had it all worked out on how cheap home mass juice would be etc. I made an RY4 once that was pretty decent. But then I hear people say they worked on recipes for like a year or more and I just say screw that.