Which vaccine Hepatitis A or hepatitis B? Did you complete the series?
From the US CDC
“It is not known for how long protection from one hepatitis A vaccine dose lasts, but it has been shown to last for at least 10 years (32). One dose of single-antigen hepatitis A vaccine administered at any time before International travel can provide adequate protection for most healthy persons.”
“How long does protection from hepatitis B vaccine last? Studies indicate that immunologic memory remains intact for at least 30 years among healthy vaccinated individuals who initiated hepatitis B vaccination >6 months of age.”