Once you've checked in and checked out on a job, the information is stored and can be viewed at any stage.
On the App:
Search the job you wish to see check-in time for
If you scroll through the diary, you'll see any entry for each staff member that has checked into this specific job, and the duration of the checkin
Login to your account online.
In the Jobs list, you can select from the list or search a job
Click Quotes and Invoicing tab
At the top right you'll see a total "recorded time" - this is the total checkin time for this job.
Move your mouse over or click the recorded time to see a breakdown of time by staff member / date