Earlier quoted context omitted.
Quoted daily ("Work is on a time and materials basis. Rate: $2,000 per day."). Invoices will typically cover a few weeks of work, depending on the tempo of your engagements, your relationship with a customer, etc.
This has to be regionally dependent. Around here there is no way you would get $2,000 day for web development. Best I have ever gotten is half that, for a one-day "emergency" engagement (i.e. drop everything and help me).
Also, I've harped on this a time or two, but there are people who get $2,000 a day for something which is indistinguishable from web development in terms of activities performed but which is sold as accomplishing business goals ("making lots of money") with incidental reference to programming.
P.S. Charge more for emergency engagements. The business stopping for a day is worth more than $1,000 even if the business is a taco truck. Don't do professional work for taco trucks.