Just use 2000 hours. It makes the math easier, plus anybody who doesn't get (at least!) two weeks of vacation with their full-time job is a chump who needs to unionize anyway.
The nice thing about assuming 2000 hours is that you can easily convert between annual salary and hourly wage by multiplying or dividing by 2 and moving the decimal point (e.g. $20/hour = $40k/year). But hey, if you'd rather do the math to come up with $40K/year = $19.23/hour or $20/hour = $41,600/year, more power to you, I guess.