it varies but usually one working week
I
It will take two to six days.
International post would mainly come to Ireland by air, as Ireland is an island. So depending on where in the world you are, you are most likely to send things to Ireland by airmail.
go to a post office and find out
That will depend on which country you are posting from, which you have not said. Prices change, so your local post office will give you the most up to date prices.
Normally you will have next day delivery within Ireland.
Ireland has no post codes, send it to Moyne, Co. Longford, Ireland. As long as your postal system can get it to Ireland we'll take care of the rest.
That will depend on what you are sending and from which country in the world, neither of which you have specified. Check in your nearest post office and they will give you the information you are looking for.
E-mail, airmail, post, ect.
Telephone your local Post Office. They have the answer for you.
3-7 days
how long it wants to