I got to the TSY Rune Phase on November 11th. I put in my 3 runes and used the rune bar to do the 4th. Since then I've picked up another. I have no Ferris Wheels or other rune shard producing buildings. Since I'm getting about 25 rune shards, (if I remember to stop in the middle of my tournament run when the rune shard bar fills up), I'll pick up 2 more for the 6th and 7th. I should then have about 5 more and in a day or two, enough for the 8th. The 9th will probably be a few days later. Not a week, but surprisingly, if I pay attention and stop to forge a rune when my shard bar is filled during my next tournament run (number 6), I'll get there in under two weeks. Not a week maybe and it would be nice if you could store more without having to stop and empty the bar in the middle of the tournament, but not as bad as I imagined in this real world example.
Of course this is doing 25x6 tournament run. If I did less it could take weeks, forcing me to have the rune shard producing buildings (with the loss of space that incurs) or to be more patient. In any case, I'm not sure it's worth it to use the space for those buildings since it's pretty rare (as has been noted) that you get to a rune phase with so few runes for that AW. But it, obviously, does happen.
AJ