I think you mean the Luna sleeping night oil by Sunday Riley- which I own and love. My process was to get a sample from Sephora (actually I got a sample in person and then got a deluxe sample as a promotion) and used it for about 2 weeks nightly. That’s a good time frame to know if something breaks you out or really works etc. I loved what it did to my skin- hydrated it but also made it less oily, helped heal breakouts and redness, made my pores look smaller (and retinol is an amazing anti-ager). Then I waited until the Sephora semi-annual sale (one in April, one in Nov) and purchased the full size on sale. I actually just purchased the UFO oil as well since it was the only thing that tamed my hormonal breakouts during my test of it