If you have a special Fridge for this, it's fine to put it in there unwrapped, like Chopsaw & I sometimes do.
However if you're putting it in your family "everything" fridge (the one the "Wife" uses), you might want to wrap it in plastic wrap tightly. That's one of the reasons why we've been happily married +50 years. I love everything smelling like Hickory Smoked Bacon---She doesn't!
As for how long to put in the freezer before slicing, I think it depends on how sharp your blade is. I need to put mine in for a little longer than 3 hours, @ Zero degrees.
Bear