FWIW I have had an engine failure at 60 ft.
At that point you have basically arrived.
You are going somewhere between 30 deg left or right and no further than what is just passing out of sight under the nose.
By the time I secured the engine and switches I was pulling the flap on while flaring to land.
Maybe 3 - 4 seconds.
"Glide Ratio"? Think space shuttle. Especially if you are obliged to stuff the nose down to maintain flying speed initially.