Most of them.  I know that's kind of vague but:


 

> ...In these five years, 813 cases involving private land claims were
> heard by the Commission : 604 claim were confirmed; 190 rejected; and
> the rest were withdrawn. Of these 813 cases, only three were decided
> by the Board: the rest were appealed to the District court and then ***a
> majority of these were finally decided by the Supreme Court***.
> 
> [Grants_of_Land_in_California_Made_by_Spanish_or_Mexican_Authorities_State_Lands_Commission.pdf][1]


So if we take this (lengthy) document at face value, over 400 (most) were settled at the Supreme Court level.
  [1]: http://www.californiacentralvalleysurveyors.org/chapter_library/library/Grants_of_Land_in_California_Made_by_Spanish_or_Mexican_Authorities_State_Lands_Commission.pdf