I have created a time entry form using a SharePoint list and InfoPath. One of the requirements is a column called 'Time spent' where they are to input the amount of time they spent on a project. It was requested in this format: HH.MM – 15 minute increments. The column type is currently a Number, and they do not wish to ask for date/time ranges.
Could anyone please offer some advice on a way to approach this? I am open to trying column validation through SharePoint or using rules in InfoPath.
I am using SharePoint Online 2016 and InfoPath 2013.