Sadly, most buyers don't understand what the word estimate means. To them, estimate means "it.will.be.delivered.on.or.before.this.date". I blew my handling time out to 5 days and still post same or next day and so far have not had any problems (yet!). I'm surprised I've had no problems because there are a few tracking numbers showing as not delivered, but I know the buyer has got their parcel.