When I went there I used the Tobu Pass
About the All-Nikko Pass [TOBU RAILWAY]
Temples around Nikko opens around 9am and closes around 4pm.
When I went there, it took me 2 days because I went all the way to the waterfalls and have a nice soak in the Onsen.
I was able to finished touring all the temples till around 2:30 PM.
Bus trip to the Lake takes about an hour, so you need to prioritize which place u need to go first.