I took BEC earlier today and finished with 30 seconds left. I would leave at least an hour for the writing.
I actually had an hour and 24 minutes to do the 3 WC's but that gave me time to write all 3 then go back and edit each one for grammatical errors.
I used Becker and didn't study very much at all for the WC's but I definitely think reading the examples helped me format my responses.
AUD- 89
BEC- 86
FAR- 60,79
REG- 63,83