The Multiline Time Entry screen allows you to add the time details you have worked on earlier and that does not have a time entry in Salesforce.
You can add up to 10-time records (check-In/out) details at a time using the Multiline Time Entry screen. If you want to add more than 10-time records at a time, click the Add 10 More entries string and you see rows to add more time records.
Note: You can only add the time details that are lesser than the current time. And cannot add time for the future date or time.