The deposition of any expert described in subdivision (b) of Section 2034.210 shall be taken at a place that is within 75 miles of the courthouse where the action is pending. On motion for a protective order by the party designating an expert witness, and on a showing of exceptional hardship, the court may order that the deposition be taken at a more distant place from the courthouse.
Source:
Section 2034.420, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=2034.420..