What is the length of day and night in the tundra?

Answer 1

12 hours each on average, same as anywhere else on Earth. At the poles there is six months of day during the summer and six months of night during the winter, but it's still 12 hours per day on average.

Answer 2

In the tundra, during the summer months, the length of the day can be up to 24 hours, with continuous sunlight in some areas. During the winter months, the tundra experiences long periods of darkness, with nights lasting up to 24 hours.