not sure
probably 4
First class mail is delivered 3 to 5 days
First Class Mail is delivered in three to five days.
First class mail delivery within Iowa takes 2-4 days.
First Class Mail is delivered in three to five days.
First class mail delivery takes 3-5 days.
First Class Mail is delivered in three to five days.
Generally 2-3 days.
By first class mail, 1-3 days.
First Class Mail is delivered in three to five days.
Takes about 3-4 days when I order things from Florida.