How to generate a hash that is valid for 48 hrs?

Hey,

I need a way to generate a hash code, which is valid 48 hrs. after it
has been generated. I need this to register my users and to activate
them.

I have the problem that this code below does generate a hash for 2
days, but this will cause problems when a user registers at 23:56, so
the hash will only be valid for the next day because it does not hash
correctly. I need a generation in hours, but I can't figure out how to
do that.

Here's what I got so far...:

return substr(Security::hash(Configure::read('Security.salt') . $this-
>field('created') . date('Y-m-d', strtotime("+2 days"))), 0, 20);

The hash is generated by hashing the security salt, the date the user
is created and the actual date + 2 days. It should contain 20 digits.
When I try to put +48 hrs into the code instead of +2 days the hash
will not be accepted anymore.

Would be nice if someone could help me on this one...
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