I am a French citizen. I have a Massachusetts driver's license and I moved to California: how long do I have to get a California's driving license?
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Have a look at the California DMV's Information For Persons New To California. Then follow the link for How to apply for a driver license if you are over 18 (mirror):
If you become a California resident, you must get a California driver license within 10 days. Residency is established by voting in a California election, paying resident tuition, filing for a homeowner's property tax exemption, or any other privilege or benefit not ordinarily extended to nonresidents.