I've gone with "once a day," but sometimes I make 3-4 moves a day per game, and sometimes it's 3-4 days per move.
I play with opening databases, books, online opening or strategy references, etc., but I don't use computer analysis or get advice from other people. I prefer opponents who also don't use computers or other people for analysis or move generation.
I have used an endgame tablebase twice now, but I'm not gonna do that any more, either.
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