Is it possible to know when my laptop was last booted, even though the SSD is LUKS encrypted?

[nonewhere]

I am thinking of using a detached LUKS header for plausible deniability given my threat model doesn’t involve actors who:

1. will resort to violence
2. snapshot the disk more than once

However, I think this idea would go moot if, somehow, even though the disk is encrypted, they can know the last time I booted the laptop and establish usage patterns.

Thoughts? I am sure there is somewhere else in the laptop beside the encrypted disk that logs this sort of stuff, no?

Thanks