Corrected entry: After Jacob gets bitten, he estimates that it will take him approximately half an hour before he turns into a vampire. What does he base his plot-convenient estimation on? Most of whom were bitten became vampires within minutes. It has been argued that this may be a result from him being a priest. Even if that's the case, with no prior knowledge on vampirism Jacob has no reason at all to think that his faith will slow down the process of turning into a bloodsucker.
Cybermoose
15th Nov 2006
From Dusk Till Dawn (1996)
Correction: Other factors may come into play here. Richie Gecko and Frost were bitten on the neck, so they turned quicker, however Sex Machine and Jacob were bitten on the arm, so it took longer. Also, other factors come into play, how fast would they be affected, this changes from person to person, plus Jacob is having a guess as well, being less panicked than the rest slows down the rate of turning.
Correction: It very well could be minutes or seconds till he turns into a vampire, but if he chooses to estimate 30 minutes, that is a character choice and not a mistake.
Cybermoose