Renfield, Count and others in “Unfinished Business”

Renfield

But I so want to be a vampire, Master. And with all this bother going on, if you were to bite me now I might be able to help, and you were gonna bite me in thirteen leap years time anyway.

Count

(Laughs) Oh, Renfield, Renfield! Is there no limit to the depths of your stupidity? A leap year is made up of four normal years. So thirteen leap years is actually forty! No... sixty! No, that's not right either.

Ingrid

Fifty-two, idiot.

Count

Fifty-two years away and by then, you'll be far too frail and dribbly to bother with.

Renfield

(Sadly) I see. Fooled again.

Count

Well, it's not really that difficult.