Notice how the ads aren't something that you would be allowed to do.
I'm not exactly positive what the requirements are (I'm sure they are not set). According to JenSense, back in 2005 you had to have a minimum of 20 million pageviews/month.
Don't focus on a specific amount to make each day, but instead say:
I want to my earnings to increase by $1 a day. OR I want to make $5 more today than I did yesterday.
This creates realistic goals that apply in the long-term AND short-term, so you won't get discouraged. :)
Let's say you're making $1 on January 1st. Then $2 on January 2nd.
By the 365th day of the year, you're making over $365 dollars a day!
$365 / day x 1 Year = $133,225
I voted for $1 a day since that's realistic. Most people use AdSense as side income. I earn between $1 and $2 a day with it. I am the kind of person who likes to set a realistic goal for the "next step". In my case that will be $5 per day.