Hi There are two bus lines from Utsunomiya West Exit of the JR Station - bus stand area. Bus lines 6 and 7. There are about 4 buses an hour and it takes 20 minutes. But not all the buses go to the Oya stone Meseum area - I think - so you should check at the tourist office, bus office, ask other passengers, ask the driver. I think there is also a special Otani One Day Siughtseeing Pass, which you can get at the bus station.

One hour, I think.

大谷資料館へのアクセスは、JR宇都宮駅もしくは東武宇都宮駅から大谷・立岩行き（行先番号45）のバス（関東バス）で20〜30分、資料館入口で下車徒歩約５分です。 宇都宮駅前の関東バスの営業所で大谷観光一日乗車券を購入すると、かなりお得だと思います。1600円（往復のバス乗降り自由、大谷資料館・大谷寺の入館料含む）

※ the path of the route bus about 30 minutes to ride from JR Utsunomiya Station West Exit No. 6 landing on Oya Tateiwa.