There are two possibilities I can think of:

• Orbit duration can be used to calculate mass
• The diameter of a star or the parallax distance on the sky (in arcseconds) can also be used to evaluate mass

I measure the mass of my stool by seconds it takes to discharge

Well the modern definition of a kg is based off of the second and the metre https://en.m.wikipedia.org/wiki/Kilogram :P

The amount of time a mass M attracts a unitary sphere up into CoM.