I'm not sure whether scheduling is editable in the other quests -- I've only been here for a day -- but in the Three Good Things Challenge, it asks you to do something every day for a week and only has one "I Did It" opportunity for the whole challenge.

I'd like to be able to schedule 7 To Dos for this challenge and click "I Did It" each day of the challenge, but that isn't an option in the "scheduling" area. (I can set reminders for every day, but cannot add additional "times" to the event.)