No, you won't learn in 300 years.
I was cutting a cucumber crosswise and Prabhupada said, "Don't cut it that way, cut it lengthwise. You will never get it right, not in 300 years." I talked back, "No, don't say that, I'll learn, I'll get it right." He said, "No, you won't learn in 300 years." But I talked back.
Reference: Memories Anecdotes of a Modern Day Saint - Volume 3
Author: Siddhanta Dasa