I would assume in the last couple of years, if you're selling a house, the hourly rate has to be really high. After buying two homes and selling one the last 3-4 years, all a selling agent had to do was get the MLS and disclosures ready, set up an open house, and wait for offers to come in. Don't even really need to spend time negotiating with the buyers. In my area, sellers were only giving the buyers agent 2%. Before the recent times, I'm sure more work was done to market and push a home in order to sell, so probably more time spent.
Buyers agents have it harder due to the amount of time working with clients going from house to house, submitting offers, and losing out. Definitely more time spent on the buyers side than sellers.