~40secs to get there. 10-15 if you use horse.
40 seconds... Too much, definitely too much. I'd like your maps, but attacker's spawn it way too far from flag. That's why almost everyone hate Burg_Rabenstein 
And if you would have read the OP you would have seen that i updated it a very long time ago to make it nicer. Also, those 40 seconds are from the very first version, which is not even on the server anymore. It takes like 20 seconds once the gates are all opened. Which is very fast imo.
I don't even like Rabenstein myself anymore because it lacks very important updates for such a long time.
Don't forget that defenders do not usually spawn next to the flag either. Average distance of defender spawn to flag + 25 seconds should be the quickest route for the attackers for map balance if you ask me. Preferably this quickest route should not be available from the start.
And that's why Rabenstein can be balanced. I've seen it go with 2:3 or 3:2 a lot, simply because once the gate is opened it is super quick to get to the destroyable gate and flag and defenders stop spawning close to it. Makes up for the long walks in the beginning.
Balance really depends on map. Jackos 50 seconds once everything is clear on the way to the flag can be a little guideline for some very simple maps, but there are balanced maps with much longer or much shorter ways to flag that are on the servers since forever. 30 seconds or less for attackers should only be available late in the round, because at that point you may be faster at the flag than the defenders.
Some general guidelines can be made, but in the end you will always have to take a look at the maps themselves.
