The time and power required for a microwave dryer to dry fish feed depends on several factors, including the moisture content of the fish feed, its size and the drying equipment used. Below are some general guidelines, but please note that specific drying times and power levels may vary based on individual equipment and needs.

1. Humidity: The humidity of fish feed is an important factor in determining drying time and power. If the feed is very moist, then the drying time and power need to be relatively high. On the contrary, if the feed is already relatively dry, the drying time can be shorter and the power can be lower.

2. Size: The size of the fish feed will also affect the drying time and power requirements. Larger feed pellets may require longer time and higher power to ensure that the inside is also sufficiently dry.

3. Drying equipment: Different microwave drying equipment has different power and drying effects. Depending on the equipment you are using, refer to the equipment's operating instructions or manufacturer's recommendations to determine the appropriate drying time and power.