When my (fine, lowly porous) hair isn't fully clean it dries quicker. On wash day it takes 3 hours to dry, and that's after letting it dry for a half hour with no product. If I applied my oil right after conditioning and detangling, it would take about 5-6 hours to dry. It loves warm or hot water to open up the cuticles to let product in. That stuff about how cold water as a final rinse reduces frizz? It also lays down the cuticle, which is horrible for lowly porous hair as it has a hard enough time getting moisture in.