In Mark, Jesus said Peter would deny him three times before the rooster crowed how many times?

Answer: Twice

Only Mark records "before the rooster crows twice"; after the third denial the rooster crowed a second time and Peter wept.

““Truly I tell you,” Jesus replied, “this very night, before the rooster crows twice, you will deny Me three times.” And immediately the rooster crowed a second time. Then Peter remembered the word that Jesus had spoken to him: “Before the rooster crows twice, you will deny Me three times.” And he broke down and wept.”— Mark 14:30, 14:72 (BSB)