How many days do I really need for a Ha Giang Loop motorbike trip and is it doable for beginners?

Plan 3 nights / 4 days on the loop, doing 80–120 km per day, which gives you time to stop for viewpoints without rushing. The roads are paved but winding with steep drops, so beginners should take an Easy Rider (local driver). October–November or March–April are the best weather windows.