A couple days maybe. You're close. I've had them go coast-coast in 4 days.
A first-class letter mailed to an address within the same mailing district from which it was posted will generally reach its destination in 2 to 3 days.
3 days
== ==
3 to 5 days
19256
1 to 14 days or more
a week
1 to 3 days
3 days
2-3 days
6 months
5 days