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involving private land claims were heard by the Commission : 604 claim were confirmed; 190 rejected; and the rest were withdrawn.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

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involving private land claims were heard by the Commission : 604 claim were confirmed; 190 rejected; and the rest were withdrawn.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

So if we take this (lengthy) document at face value, over 400 (most) were settled at the Supreme Court level.