Minimum space for toilet

Hi,
I am remodeling a small bathroom. On the right side of the toilet there's a tb bathtub. On the left side is a standard height vanity (22 inches deep). The toilet will be Cadet 3 Right Height (16 inch rim height). It's hard to visualize if there's going to be enough space to sit on the toilet without vanity crowding you.

What is considered the minimum comfort distance from the side of the vanity to the toilet, measured either to the rim or to the center?

Thanks.

15" from the center to the side.
24" in front of the bowl.