I would be surprised why someone would need to book more than 15-30 days out, isn't that plenty of time in advance?
Actually, 15 days, no. 30 days, yes, but just barely.
- The trip is about 3 weeks overall. 15 days before I'll already be traveling.
- The day I'm planning to take the train is at the end of our trip (second-to-last day). We finish our trip in Krakow, and we fly home from Warsaw, so we need to get from Krakow to Warsaw reliably (we'll take the train the day before our flight home and spend the night in Warsaw, to ensure we don't miss the flight).
In our case, the window for advance purchase tickets will open less than a week before we leave for Europe. So yes, that should give me the chance to buy the tickets, but I know how busy things get in the last few days before we head out on a trip, and I prefer to nail down everything I can, well in advance to minimize the last-minute tasks.
I've put a reminder on my calendar to buy the tickets online once they become available, and I can make it work. But it's now less than 4 weeks until I leave, so I'm currently trying to tie up loose ends.
I am fairly obsessive about trip planning details. I think that makes for a less stressful, more enjoyable trip. :)