In Hc, if you get there early enough to do so, you can shoot all 40 in 1 day if thats what you want. The entry fee does cover your cost to shoot this event wether you shoot it in 1 day or spread it across all 3. The only real tricky part is playing the weather. If you are locked into the 1 day approach, you have to work with whatever Mother Nature gives you.

Indoor worlds is just a 1 day shooting format, once you start you don't stop till your done. The "Worlds" in Snowshoe is a 2/3 day format with an extra day to play the weather if needed. In this event you will have set days and ranges, and can not shoot all in 1 day. The 3rd day is for those who make the cut after the first 2 days shooting.

I hope this answers your question.