Set-up multi week boarding & training

I am using Wix Editor to build a site for a dog trainer. He wants to off 1-4 week boarding and training. When I set it up as a Course, I am asked for how long the session goes, but won’t allow for this duration. It also shows a start start on the site. See the screen shot. It says “ended” and at the top it says this service isn’t being offered and to call. I don’t want either to appear as there is no Course start/end date as the timing is up to the client.
I want it so I just have the clients go to book a week or more, which then has a fixed flat fee like 1 wk = $1800, 2 wk = $2800, etc. What’s the best way to do this?

Bumping up in case someone has an idea