7 days is ideal for a first challenge — long enough to build momentum, short enough that people finish. Save 14 or 30-day challenges for once you have an engaged audience, and expect a natural drop-off you can offset with mid-challenge recaps.
No. Recognition often beats prizes — a feature, shoutout or community badge motivates people more than a giveaway and keeps your challenge free to run. The planner lists zero-cost recognition ideas for exactly this reason.
Make entry frictionless: one clear hashtag, a simple daily prompt, and a way to tag you. Then reward participation publicly in the first hour — visible engagement early tells others it’s worth joining.