It depends on weather conditions, and also what time the letter arrived at the post office. My guess would be about 3-4 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
3 days
1 to 14 days or more
1 to 3 days
a week
2-3 days
6 months
5 days