How long does can it take to list organically?

Sorry if this is a basic question, but can’t seem to find a good answer besides tips on ranking faster.

After creating a good listing and paying for ppc campaigns, how long can it take to start listing first page organically? I started with amz mex, and been a month doing ppc campaigns, sometimes I get to see it on first page with certain keywords, but the next day could be gone, and ppc is on 40% acos, which really is kinda screwing me up already.
Thanks for any help:)