Questions from a TKTS newbie

My partner and I will be in New York from October 15th through 19th. We're thinking of doing the following shows through TKTS/other discount methods: 1) Once on This Island, 2) Head Over Heels, and 3) My Fair Lady.

Assuming it's still open, we will likely do digital rush for Head Over Heels. For the other two, how bad is the TKTS line on a weekday and when would we have to arrive? It looks like MFL is listed daily at TKTS, but do they ever run out of inventory?

Thanks in advance - this is the first trip I haven't just bought everything in advance, and it's a new experience for me.

iabwayfan said: "The line will be worth the wait the first time, because you can show your ticket stub and take the very, very, short line the next two times! Absolute BEST thing about TKTS is that short line!"

This is called the 7-Day Fast Pass Window if you're looking it up!

Once on This Island is pretty easy to do lottery, as they offer lottery loser tickets for $10 more if you don't get picked. And it's pretty hard to get a bad seat there anyway...

Otherwise, if you can join TDF, you can probably have Once and Heels sorted in advance for under $50/ticket.

iabwayfan said: "The line will be worth the wait the first time, because you can show your ticket stub and take the very, very, short line the next two times! Absolute BEST thing about TKTS is that short line!"

Could you please elaborate on this? I've not heard of a "short line"; how does this work?