In most cases, malaria is transmitted through the bites of female Anopheles mosquitoes. There are more than 400 different species of Anopheles mosquito; around 30 are malaria vectors of major importance. All of the important vector species bite between dusk and dawn.
When replayed at normal speed, time appears to be moving more slowly. A term for creating slow motion film is overcranking which refers to hand cranking an early camera at a faster rate than normal (i.e. faster than 24 frames per second).
Numerically, 30 seconds is a larger number than, say, 1/125 of a second, but it's not a faster shutter speed. So, while shutter speed is not an inverse square relationship (like light intensity), it's still an inverse (first power) relationship: The smaller the fraction, the faster (higher) the speed.