Three days, the cart opens on day two, and it closes a couple of days later. Then a fortnight of follow-up. Fill in the top and every date, email and live below moves with it.
The paid upsell is the workbook, an extra call or extra resources. It covers your ad spend and turns freebie seekers into buyers, and a buyer is easier to sell to next time. Around one in ten of the people who sign up will take it.
Three days, and the cart closes two or three days after. Never run the challenge days across a weekend.
One a day. The challenge has to relate to the thing you're selling, and solve a problem you can solve across three days.