Camping actually gets the 153 days theory from Revelations 9;5-6
Revelations 9;5-6. And to them it was given they should not kill but that they should be tormented for Five Months and their torment was as a socrpion that striketh a man. 6. And in those days man shall seek death but shall not find it. And shall desire death but ti shall flee from them.
I read the info from someone else. Regardless, Camping made a whole lot of errors.