All that it's about is to get the "experience points earned" screen with the XP summation once during a day, counting in the GMT time zone, UTC +-0. The time left is shown in the main menu of the game client, close to the red "!" or green check mark.
Minimum effort is one hole, all kinds of games count, be it practice, ranked or challenge.
Just don't try to play a big game or a multiplayer if the time left is running out. It's about three minutes to set up your favourite hole (mine is STA#17 frequently) and get through it.
I've become used to do it in the morning, while checking mail for the first time. Hope that I can continue my streak of 299 on a journey the coming weekend :)