According to that link, those time values are stored in seconds in the array at $C599. $0A is 10 seconds for example. Increasing that value should give you more time.

"This duration depends on the player's title. There are 16 different titles therefore the titles 0 - 3, 4 - 7, 8 - 11 and 12 - 15 will get the same wing boot duration. The array at $C599 contains the four values $28, $1E, $14 and $0A which are the duration in seconds for the four title categories (in reverse order)."