check the label on your container, it should tell you.
from the label i found here on the web it says 7 days between application and harvest, minimum. but read your lable!
PREHARVEST USE RESTRICTIONS
Observe the following preharvest intervals (number of days between last application and harvest)
Garden beets (roots), radishes, rutabagas, turnips (roots), carrots, potato,
blackberries, boysenberries, dewberries, loganberries, raspberries, blueberries,
grapes and strawberries. 7 days
It also says MAXIMUM number of applications per year is 5 times for raspberries.