How far is Tsutanuma from Tsuta Onsen

So I read that in order to reach Tsutanuma, I need to ride this bus and get off at Tsuta Onsen:
http://www.jrbustohoku.co.jp/route/detail/?RID=14&BID=476

How far of a walk is the Tsutanuma lake from the bus stop? Will there be signs leading to it? We only have 1 hour alloted in the area since we have to ride the last bus back - will this be enough? Thank you!

Below is some relevant information on a thread in another forum. Just note that 1 hour is not enough if you want to walk the whole loop trail.

https://www.tripadvisor.ca/ShowTopic-g294232-i525-k12032501-How_to_rea...

It is about 500 meters from Tsuta Onsen to Tsutanuma, and it is a distance of about 10 minutes on foot.
The current time is full of tourists, so one hour may not be enough.
（Especially in the early morning it is very crowded.）
It is a very beautiful place, so you should have plenty of time.