Using laminate worktop as a desk

[dal]

Hi, so I've ordered a length of 40 mm thick laminate worktop that I will cut to size and use as a desk.
I've since read that it's not recommended to fit worktop right up to a wall because of expansion.
Now the worktop I've ordered will span the gap between 2 walls which is 2.5M. Do you think this will be ok being as it will be in a bedroom and not subject to the sort of moisture you'd get in a kitchen. I was planning on chasing out the wall a bit and sitting in about 5 mm into the wall.
Also does it need to sit in the house for a few days to acclimatise like laminate flooring ?

Cheers

 

[dal]

...moreover - will need supporting in the middle though, per earlier threads ?
can't really see why you would damage the wall as opposed to a screwed on batten.

Will be setting into wall so as to be flush with wall and yes will support the front with breakfast bar legs