Schools should include details of how many compulsory hours a week they are open for in their Spring School Census. For more information from the DfE about what is required, please see the DfE's Data items guide.
If you have errors or queries in your census for this field, you will need to resolve issues in the data - you can see how to do this here.
Go to School > School Details and click into the Weekly Hours Open field.
Add in the hours in a 00:00 format, then click Save Changes. For example, 25 hours and 30 minutes should be input at 25:30, not 25.50.