Should be 10 frames for waveland, tchnically 14 frames for WD since you have to include the Jumpsquat. Off the top of my head so forgive me if I recalled incorrectly. I usually think of it as about half-way through the WD slide before you can grab.
EDIT: I cannot recall one IC missing the AC. Let me know if this can be done consistently as it would be a funny desync.
Uh I can't remember off the top of my head but 10 frames sounds about right. Im not sure, but its significant.
Im also not sure about desyncing off an AC aerial, I don't think you can do it, since nana is just recieving the inputs later than you (this is included with when she jumps), but it might be possible.
A great desync nobody uses (myself included) is the L-cancel desync. It's so good. I'm trying to work on making that, ftilt, and dd my go to desyncs and erasing roll and spotdodge from my memory banks.
Also some things I want to talk about:
1. The ICs have an amazing (and under used) walk. We like to approach/retreat with WD a little more than we should, and walk is ridiculous.
2. I'm going to work on practical applications for dash cancelled utilts. I used to use them all the time with pichu/fox, but I never used them with ICs. They are pretty good though, because I like dashing on the ground a lot more than WD in most cases.
I find these useful against characters who like to hop over you when you approach them on the ground (fox, falco, falcon, ganon come to mind)