.2 seconds was a made up example.
I actually haven't tested the exact physics of a jab lock, nor the timing precisely by -frame- which is all that would matter.
Example of what I need to test-
Unlock - Frame's 0-36 (fake example) of boomerang knockback
Lock - Frame's 37-49 (more fakeness) of boomerang knockback
unlock - frame's 49 to ending (even more fakeness) of boomerang knockback
I'm pretty sure the knockback is faster then 49 frames in the first place =p but I think you can understand what I mean by that testing.
Unfortunately, even if I did any testing, by the time I finished I would probably have had to get off my mom's laptop, and would not be able to post it until I'm ungrounded.
The margin of error may be as large as 2 seconds, or as small as 0.02 seconds ( if it was the latter however, you would very very rarely see any jab lock that lasts more then a single jab or two )
Also, unless you use the several boomerang-induced methods of knocking someone down towards you (I'll be updating my old old topic about this, including some testing of animations that cause this), you can't jab lock them from a boomerang throw, because they do not land close enough to you. You can use an arrow, because it's faster and locks them in near -perfect timing- when you're continuing a BAL/BACL lock, rather then going for a follow-up or jab lock from the second BAL/BACL (as far as I've tested, it is impossible to jab lock from the first BAL/BACL, you must use a second grounded BAL to actually lock them)
EDIT:
Also, you did not waste my time. You brought up several new things I can test, and posted the question that others may not have asked. There is no such thing as a stupid question, only stupid evidence.
Example of stupid evidence:
"That Samus only lost to your Link because Samus is a bad character" < real comment on one of my vids on youtube.
My reply:
Bad evidence.
1. Samus is higher on the tier list, therefore a 'better' character by your standards (assumption)
2. Samus has many advantages over Link, especially offstage where something as 'worthless' to most Samus mains, can gimp us at basically any %. (down-b)