Yes, you can earn a maximum of €60 in Grover Cash per month. Once you reach the €60 Grover Cash limit, you'll have to wait until next month to earn more Grover Cash.
The €60 Grover Cash limit applies even if you redeem some of your Grover Cash.
Example: You’ve earned €50 Grover Cash by January 24 and redeem €20 Grover Cash—then you can still only earn €10 Grover Cash in January, not €30 Grover Cash.
Refunded card payments don’t count toward the Grover Cash limit.
Example: Your balance is at €20 Grover Cash in January and one of your card payments is refunded, which initially earned you €5 Grover Cash. Your new balance is at €15 Grover Cash and you can still earn €45 Grover Cash in January, not €40.