I just found a way to do 4-3 FPG. Is it too hard for humans to do?

Hello, I was messing around with 6-1 and found a setup for 6-1 FPG using a TAS (It doesn't use L+R). Is it too hard for humans to do?

Is this clip fast enough for lightning 4-2?

I had a run today. How do I time it?