I can share some information about time tracking in QuickBooks Online. 

The QuickBooks Online Time Tracking feature allows your contractors to fill out their time worked. All you need to do is enabled this feature in the Company settings. Then, assign a time entry only user access rights to your contractors. 

Here's how to turn on time tracking preference:

1. Select the Gear icon, then choose Account and Settings.
2. On the left-hand menu, click Advanced. 
3. Choose the pencil to the right of Time Tracking 
4. Click the Add Service field to timesheets or Add Customer field to timesheets. 
5. (Optional) Check the Show billing rate to users entering time.
6. To select the first day of the workweek, use the drop-down and select the day to begin each workweek. Setting the first day of your workweek affects how employees and contractors view Weekly Time Sheets.
7. Select Save and click Done on the bottom right.

Once done, you can now enter the time. To proceed, please see the steps below: 

1. Click the +New button.
2. Under Employee, choose either Single time activity or Weekly timesheet.
3. From the Name dropdown, choose the name of the contractor.
4. Input some needed info. 
5. Enter the number of hours and minutes worked in the Time field.
6. Once done, click Save.

Please make sure that customer information in the time activity is accurate so you can add an invoice to your customer.

For more info, please visit this page: Turn on and set up time tracking in QuickBooks Online. 

Additionally, let me share this link to help you view, change, or approve QuickBooks Time timesheets in QuickBooks Online Plus.

If you have questions about the process, don't hesitate to leave me a comment below. I'll be here to answer them for you.