If you are on the Flexible plan, your payouts are not fixed; they go up and down based on market prices in your area, how often your system is actually called upon for grid balancing and the specific electricity supplier you use.
Additionally, if you manually limit the hours your system is allowed to participate, your earnings will drop.
For the highest possible payout, we highly recommend letting your system participate 24/7.
This article teaches how you can optimize your payouts.