I'm using Odoo 17.2 online version, and I'm trying to get the value of the timer in project tasks and add it to a timesheet using a python script. 

I tried using

record['timer_start']

but that just gives me the timestamp of when the start function was called. I also tried

record['timer']

but that doesn't exist.

Can someone please tell me how to get that number?

Thank you in advance.