How much time should I'll wait between lines of meth? How long does it lasts?

So yeah, I'm planning to do meth and wanted to do it right. And I'm having a lot of questions like How much material it's enough for a line? If I'm planning to start the day in 5 hours, at what time it would be wise to snort my last line? What can I use for comedown? I have on hand pregabalin and tramadol. I know shit is bad mkay, lets skip that statement. Oh I have a quarter of gin also.