Make a user macro for windbite.

Use venom bite first

/macroicon windbite
/ac windbite
<wait.16>
/e BITE <se.8>

Venom bite lasts 18 seconds. Minus (rounded up) 2 seconds in between actions. The /e command makes it so only you can hear the sound effect. This way, you'll hear a "ping" right before venom bite wears off. It's a lot easier that constantly looking at the status bar.