Under Calculation of In-home expenses- Once you answer that you using a Common room- you will then see further down "Average hours per week you worked in the common space"- This is where you will enter the average amount of hours worked per week.

Thank you for choosing TurboTax

So does rent always fall under Zero rated and exempt? 

Yes it does as you are not charged taxes on your rent.

Thank you for choosing TurboTax.

Thank you Ginette. Also wondering, given I share rent and utilities with a roommate, I will only be putting in the share that I pay on the T777 correct?

And will I be putting those exact amounts on my T2200 as well?

Thanks

Yes, that is correct you will enter the part you pay.