Case note: dual-card desk near Gwanghwamun
A day trader ran a 3060 and a 4060 Ti after the US cash open. Credits looked fine on the pool dashboard; the apartment bill did not. During the Profitability Review we rebuilt the model with progressive brackets and a realistic 5.5-hour nightly window. The dual-card schedule only cleared costs on two coins the client already traded around — other algorithms were ornamental. They kept one card on a tighter window and parked the second for seasonal difficulty dips.
Reservation: the client waited two weeks for cleaner smart-plug data, so the first deliverable used manufacturer watts with a confidence note. The revised sheet, after measurements, shifted break-even by several days.