The formula to use is: 
Where:
h=height
v=velocity
t=time in seconds
Plug in the knowns:
Differenate and multiply the results by 2.
Multiply the results by 2:
2(2.03125)=4.0625
Or you can factor it:
65t-16t^2
16t(4.0625-t)
t=0 or t=4.0625. ---> this would be a proving statement, if you were asked to prove it.
Hence, the time it would take is 4.06 seconds.
Paul.