How much do they block on your credit card

[Smurf2017]

When we register a credit card at checkin/onboard how much do they block. We are only doing a one night cruise, so do you think it would be any less? I've tried emailing but of course there is no answer forthcoming!

 

TIA

[Smurf2017]

For the benefit of anyone visiting this topic in the future, here is the answer as at April 2019.

 

On a 7 night cruise they block 200 €/USD depending on the location of the cruise.

 

On a one night cruise they do not block anything.