Sounds a bit like the old joke about American tourists in Europe " If it's Tuesday this must be Belgium"

Anyway, you lucky *.*.*s, 48 days away on a bike!

If what the pair of you want is 48 days riding,touching on as many countries as possible then good luck to you. There are a few more you could add to the list. Whatever you do you will have a fantastic time..Just don't expect to actually learn anything about the amazing variety of cultures that still exist in Europe.

A large part of Europe has, scenery apart, a surface sameness now, people wear the same clothes,listen to the same music,watch the same films.(although for some the the actors mouth movements don't quite match the words).
One thing I have learnt from moving here to Austria is that beneath this (plastic) veneer there are fascinating differences in traditions, attitudes and outlook. There are also places of real interest that those rushing to the next place simply pass by. I suppose what I am pleading for is the small experience, the local festival of whatever, the half forgotton ruin that turns out to have played a part in a major historic event,the side road that leads to nowhere, the sort of nowhere that leaves you gasping for the words..

So my advice is don't just go for the obvious places. If you have only a short time in each country at least try to seek out some off the beaten track ones too, there you will find experiences that will linger in your memory for ever.

If I can help at all with information about southern Austria/Slovenia/NE Italy let me know (click on my user name for contact details)

Please don't think I am saying don't go for as many coutries as possible, it's your holiday, work out whatyou want to do and go for it.

Have a great time whatever you do,ride safe

John