In my experience being based in Canada, about 2 weeks on the lowest costing method.
Maybe that is somewhat useful to you although id assume you live quite a bit further. My suggestion is just to take whatever product you're thinking of buying into checkout and filling out the form, you should get a variety of options which will tell you how long and the cost of overseas shipping.
Someone else who has purchased an item from overseas could probably give you a better answer of how long it realistically takes, perhaps you should say where you plan on shipping it to?