With 23 to 25 days in April 2027, you've got a beautiful amount of time, but Europe is bigger than it looks on a map. Pace it wrong and you'll spend the whole trip packing and unpacking instead of actually being there.
Moving from Munich up to Prague, then all the way down to Vienna, just to come back west to Salzburg? C'est un cauchemar! That's a real zigzag, and it'll cost you hours staring out train windows instead of enjoying a glass of wine on a terrace.
Here's how I'd think about timing for each stop, pour être honnête:
Munich & Prague (3–4 days each). This is the sweet spot. Enough time to take in the architecture and the food and actually breathe, without feeling rushed.
Salzburg (1–2 days, max). It's gorgeous, but small. The historic center is compact enough that you can cover the medieval alleys and the castle in a day or two. You only need more if you're planning to hike in the mountains.
Paris & Amsterdam (5+ days each). Trust me on this one: five days is the bare minimum for either city. Between the museums, the neighborhoods, and just sitting at a café watching the world go by, you'll want the time and Amsterdam rewards a slower pace the same way.
If part of the route has you driving through France or Germany, especially in an electric or hybrid car this might help: Top suggestions for a road trip in France, Germany, or Spain with an EV or hybrid (https://www.europezigzag.com/2025/05/top-suggestions-if-you-are-planning-a-road-trip-in-france-germany-or-spain-with-an-electric-or-hybrid-car/). This is relevant in south of Germany AND Czech Republic.