The idea is that they're tier based, with 4 tiers.
These prices and tiers are not final.
(0sec - 10sec) and (0 MB - 0.75 MB)
(10sec - 30sec) and (0.75MB - 1.75MB)
(30sec - 2min) and (1.75MB - 7MB)
(2min - 6min) and (7MB - 20MB)