super über slow motion

Hi,
I'm an artist working in Norway and just got twixtor pro installed. i have a very bad problem I need to solve NOW. I have a footage of a guy doing some movements with his hands and need to slow it down as much as possible. I am not talking about 25-50%..but maybe from 3 sec material to a minute.
I know, this sounds completely ridiculous, specially if shoot with a normal hd camera with normal speed. Well, that's the problem.
The second problem is that I basically know jackshit about after effects and twixtor and need all help i can get.
Can you please tell me how to extremely slow down the speed in the best way possible?
pleaaaase?

thank you all!