One study found adequate serum antibody titers to last for at least 6 years for feline panleukopenia virus, 4 years for feline calcivirus, and 3 years for feline herpesvirus in cats vaccinated at 8 and 12 weeks of age with polyvalent killed vaccine. (canine-epilepsy-guardian-angels.com)
Kittens usually receive a combination vaccine for feline distemper, rhinotracheitis and calcivirus at seven weeks, 10 weeks and 13 weeks, with a separate rabies vaccine at 12 or 13 weeks. (pets.costhelper.com)