How to Plan a 20-30 Day Family Trip to Europe: Best Routes, Stops & Start Points (Including London): A Complete Guide Can You Really Cover Multiple Countries Including London in Under a Month? Without a doubt. A vacation of between 20 to 30 days in Europe with three people in tow strikes the right balance between depth and exhaustion. One will neither be dashing around Europe from one country to another like a tourist nor staying within a single location for an extended perio