Challenges Time Locked

Why time lock challenges for 3 days at a time? Seems like an odd choice for player retention maybe try staggering it between different map zones or have community challenges that happened every 30 mins or an hour. Idk Im really hoping there's going to be more challenges so it won't feel so dry every time you log in. I really wanted to play skate like all day but I got all my stuff done now Im just kinda rolling around like Sonic the Hedgehog lol Having this be a live service means we need to have more of a reason to log in every day.