For the recalculation process, the user can schedule the recalculation process as per his specific date and time. With the provided details, recalculation for the given rollup will be done as per the scheduled date and time. For scheduling the recalculation process, the user needs to create a “Schedule-Triggered Flow” for it. Please follow the following steps:
Create a Schedule-Triggered Flow.
Set the date, time, and frequency as per your requirements.
Create one record of the “Rollup Recalculation Event” object.
Provide the API name of the rollup recalculation record to the Rollup Recalculation Name field of the “Rollup Recalculation Event” object.
For detailed step-by-step instructions, please refer to the article here.