A. This will depend on the waterproof rating of your jacket and how heavy the rain is/expected to be. The higher the waterproof rating of a jacket the longer the jacket will remain waterproof for. A showerproof or water resistant jacket is suitable for light showers but not for heavy or sustained downpours. A waterproof jacket with a rating of 5000-10,000mm is suitable for just about all weather conditions.
Q. How long can I be outside in the rain in my waterproof jacket?