first and last backpacking trip..to much?

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30 days alone, i want to do thailand, nepal, czeck, italy, turkey, greece, spain, amsterdam and maybe london.

I'm worried this is going to be to much traveling, money isnt an issue. Do you think just doing 30 days SE Asia? is a better idea? or 30 days only Thailand? Most likely I will never be able to do another backpacking trip after this one.

And i can't take off more then 30 days of work.