The post office claims 2 to 3 business days, but could take up to 10 depending on distances.
You only need 1 stamp to send a letter from California to Illinois. The distance does not matter as long as it classifies as a letter and not a package.
It usally takes four to five days ,to send a letter from Kentucky to California.
By first class mail, 2-7 days.
First Class Mail is delivered in three to five days.
Ca
1 to 14 days or more
It is possible to send it overnight and have the letter arrive the next day.
5-10 working days.
maybe a week
By first class mail, 1-3 days.
If it's a standard first class letter, it's one stamp (current 44 cents) regardless of location in US.
First Class Mail is delivered in three to five days.