We will have to wait for
@Roy Growin to come on-line but I thought he was recommending putting the flowers in some water to push many of the worms or insects out of the buds since that was how they washed bugs out of berries and fruits. Then after 8 hours of the water soak it is time to do the Hydrogen Peroxide rinse. Though, 8 hours does sound like a long time and I am thinking that an hour or so should be enough if other washes and rinses are done.
My recommendation is to follow the Hydrogen Peroxide wash, about 5 to 10 minutes, with a Baking Soda and Lemon Juice wash. The Baking Soda and Lemon Juice will cause a gently foaming reaction when they are mixed. That can really push all the insects out into the water and again for about 5 to 10 minutes. Then two rinses with clean water.
I use water at approx room temperature. If the water is too warm or hot it does look like it is cooking the buds. Cold water also seems to darken up the buds so I decided to use 'room temperature' when I bud wash. You can experiment after each grow and see if you like a different temperature.
The method above that I like using ends up with a water change after the peroxide wash, a change after the baking soda and lemon juice wash and then a water dump after each rinse.