I've been thinking about measuring the time I am taking for each of the practices. But I either cannot open my eyes in between or set alarms as they would disturb the main practices.
I've recently found this link and wanted to share with you.
You just need to start the timer and move the cursor to be on "split" button before closing eyes for Spinal breathing. At the end of SB, I click mouse button once and continue to meditation. Then before samyama one more click and one final click at the end. I would get all my practice times