The estimated time of arrival (ETA) from Arusha to Ndutu for a game drive is usually about 5 to 6 hours by road.
Even though the distance is around 260 km, the roads (especially the last part inside the conservation area) can be rough and dusty, which makes the drive slower. So, if you leave Arusha at around 8:00 AM, you can expect to reach Ndutu by around 1:00 PM to 2:00 PM, including a short stop for snacks or bathroom break.