Corebook pp. 233-234

A fully established bond takes three drinks directly from the vein on three different nights. It causes a stain on the third night, upon the creation of a full bond. The first two drinks cause infatuation, but this effect is solely flavour. On the third night, the Blood Bond begins at a strength of 3. It can grow to a maximum of 6, or decrease at the rate of one level per month if the thrall tastes none of the regnant’s vitae.

Resisting the bond: Resolve + Intelligence vs. Bond strength. Once per turn if in presence of the regnant, otherwise once per scene.

On server: the bond decreases at the rate of one level per in-real-life month, aka four weeks.