Encrypting a file [properly] takes several times more than actually copying it, and it already takes a while to encrypt a gigabyte. Multiply by 2048 and you have your estimate.
Anyway, if you're afraid of you parents deleting anime on your PC (which is



funny), why not just put them in the OS system files location, make the directory 'hidden' and assign it the system attribute? Perhaps you could also disable search on the system a well. I doubt your parents would be able to figure out anything like that.
Or, you might as well get a dedicated external drive and safe, since an encrypted drive will not do well in performance.
Actually there was a court case already where police couldn't access the evidence because of truecrypt. Know what happened? The accused was ordered by the court to give the password or else be punished for not cooperating with the law. If I remember he told them that he forgot the password, something they didn't believe.
So yeah, so much for that. When you really need truecrypt to hold your secrets, it becomes "an obstruction for investigation" and you get punished regardless.
Huh. Looks like someone should have used the hidden volume feature.