you can't get away with only once a day, in my opinion. A badly timed opponent turn, combined with being slightly later then the previous day, results in missed turns. I personally maintain at least twice a day (morning and evening), with slightly more if I have the time and feel like it.
Having teammates to discuss the game with in doubles, trips or quads encourages slightly more active behaviour, to facilitate good communication.
Een van de Veroveraars der Lage Landen
And a member of the Republic