@Iverem Rose There's a 4.5 year old cold calling thread on the agentsonline forum, the consensus seems to be that 5-7pm weekdays is the best time to reach people, but that 8-11am is the best time for you--the person making the calls--for exactly the reason Michael mentioned, you need to do it when your energy is highest.
The guy who started that thread claims to be making over 100 dials per hour and contacting (speaking to an adult) 200 people each morning, Monday-Friday. He works a section of Toronto with 50,000 numbers, so he's calling through the entire area about every 6 months.
He looks for motivated sellers who MUST sell in the next 30 days and are willing to sell at a price that will guarantee a sale in that time. And finally he's making about $500k a year in commissions.
Hope you find that info helpful. Obviously cold calling is a lot of hard work, but apparently it's very profitable too. Very low start up costs and overhead too.