My boyfriend was accused of a crime the police came to my house with a search warrant for my vehicle. How long can they keep my car

It depends. If the cr ios evidence then it may be kept until the case is over. Usually and in most cases, once the car is processed and swhatever evidence is sought is removed fromthe car, the police will release the car to the owner. Be prepred to porve that you are the owner. You should call the police depwrtment that seized the vehicle, speak to the assigned detecitve and ask politel;y when yur car can be released to you. Explain that you need the car for work, or for family and again, be polite when yiu are speaking to the detective. Civility can go along way!