/gamerule commandBlockOutput false
/scoreboard objectives add TicksPlayed minecraft.custom:minecraft.play_time
/scoreboard objectives add MinutesPlayed dummy MinutesPlayed
/scoreboard objectives add MinutesPlayedTmp dummy
/scoreboard objectives add DivideNumber dummy
/scoreboard players set #TicksPerMinute DivideNumber 1200

 * Repeat/Unconditional/Always Active
/execute as @a run scoreboard players operation @p MinutesPlayedTmp = @p TicksPlayed
 * Chain/Unconditional/Always Active
/scoreboard players operation @a MinutesPlayedTmp /= #TicksPerMinute DivideNumber
/execute as @a run scoreboard players operation @p MinutesPlayed = @p MinutesPlayedTmp

/scoreboard objectives setdisplay list MinutesPlayed