I'm here to assist you with payroll, jdoty.
QuickBooks Online follows the 12-hour format. Also, when you run the payroll, the system automatically converts the total time into decimal form.
In your example, 1.50 is equal to 1 hour and 30 minutes (1 1/2 hours). Let's try to run payroll and enter 1:30, and you'll notice that QuickBooks will change it to 1.50.
In case you need help in, here's a quick guide on how to create paychecks in online payroll.
If you have other questions, let me know. I'm always here to help.