how long does it take for us first class mail
First-Class Mail. In most cases, the first-class mailing option takes from one to three days on average and three to five days for delivery to Alaska and Hawaii. To use the first-class mail option, prices are based on weight of up to 13 ounces maximum.You can only mail postcards, greeting cards, letters, envelopes or packages via this service.o use the first-class mail option, prices are based on weight of up to 13 ounces maximum. You can only mail postcards, greeting cards, letters, envelopes or packages via this service.