A livestock guardian's coat means the tick check is basically a full evening event
Duchess is out with the goats most of the day, that's her whole job, and between the sheer volume of coat and the ground she covers protecting them, checking her properly takes real time every single evening. Started doing it in sections over about thirty minutes rather than trying to rush through the whole dog at once. Worth every bit of the effort given how much exposure a working guardian breed actually gets compared to a yard dog.
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Sounds like a proper job, both for Duchess and for you doing the checking. Good on you both.
Heavy-coated working breeds really do need this level of commitment, respect the sectioned approach instead of trying to rush it. Listing page here for anyone considering a Great Pyrenees: https://allinpets.com/pets/dogs/great-pyrenees/
A guardian breed's coat combined with actual working hours outside creates about as much exposure as it gets, thirty minutes sounds reasonable for that amount of coverage. There's a solid resource on proper technique worth applying here: https://allinpets.com/blog/dogs/tick-prevention-for-dogs-62/