Shortest time possible. Unless your fermenting in sealed stainless your beer is oxidizing.
This past weekend I racked a lager to lagering keg 7 days after pitching and about 6 points above FG. Should carbonate naturally perfectly over next couple weeks.
Is 6 points consistent, for the most part, across the board. I do think a beer producing its own carbonation is more stable. I'd like to scrub that O2 with this method. I purge my kegs, but long term storage tells me there is some oxidation going on.