Suppose that as I start a new shoe,
(that I will end up playing all because the count will be good enough to stay through the whole shoe tho I would normally wong-out if the count went negative)
I count the first 10 that comes out as a 5
my hi-lo RC would be off by 2 for a whole shoe of betting

How much damage would such a mistake do to my EV?

I hope this is not a too difficult question
I think it would be interesting to know because usually the costs of mistakes are calculated on an individual basis where as mistakes such as this one will affect the outcome of several rounds.

Thanks in advance for any help
TAO