I'd start by playing only long games here on chess.com. Get used to sitting for awhile and concentrating. I'd also talk walks during your games, check out other players games, and try to keep your mind fresh. ThEre are a lot of suggestions and I am sure you'll get a lot!
Tournament Coming Up?
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I"m used to mostly playing 5 minute chess and at the very most a 30 minute game with some friends. I have a OTB tournament coming up in about a month. What are some good ways to start preparing for a 4 hour game?