france-visas.gouv.frIn order to extend your stay beyond the period of validity of your visa, you must apply for a residence permit at a prefecture.
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You are allowed to extend tourist visa and extend your business date if you are B1 or B2 holder. The typical amount of time granted to a B visa holder is one to six months. The maximum amount of time you can extend on a B-1 visa is up to 6 months, for a total of 1 year.