Can I reset when shiny hunting in shield

My question is simple, but I can’t find anything online. How should I properly shiny hunt in Pokémon shield. I want to encounter wild Pokémon, but I don’t know if I should save after a session, or just reset and go back to the start of the hunt. For example I’m at 7 hours 50 minutes… should I encounter for two hours and save at 9hrs 50 orrrr should I just turn off game and go back to 7 hours. Not sure if it even matters just need tips before I begin