I think the time limit for challenges is right on track. I do miss when challenges used to be spread further apart, I feel like I am ALWAYS working in a challenge... I was once a new player, gotta work at it to get has far as I have. I never gave up and neither should new players.
5 day challenges are the best, I prefer not to work on them for weeks, and 5 days IS a challenge! Great game but it is time for an update, we all have bigger phones now, get with it Restaurant Story!!!