Worth doing. Each manufacturer will have different instructions depending on tubes, caps and resistors used. Woo Audio give a 6hr max, Feliks 8 but others more and some less. No hard and fast rule!
Edit. Back on the dCS system. I really like how they’ve made a top end headphone focused system. Looks good but I do prefer the overall looks of the Atom HE more. I’d like them to use a glass panel for the front if they decide to create a top end version of the Atom HE.