Outdoor tanning tips?

I tanned for the first time in foreverrrr the 29th. 20 min on each side. I only used Hawaiian Tropics royal spray or w/e it's called (no spf I know, bad) I did not get burnt or red. What would you suggest as far as time spent out for tomorrow and the next day etc.? And what stuff should I use? I have an spf 8 and an spf 4 lotion. And 30 spf chapstick (I use it) I want to be 80s tan, how long will it take? P.S. Please no comments on skin cancer/aging, I know all about them and I don't care.