Before, we could use real-time templates as multi-day tournaments. Now we have to remake the entire template from scratch. It's good if the purpose is to dissuade people from making tournaments. I ran into this problem twice now and decided to just give up.

u can just adapt the boot time, i believe.... at least i've been able to... i believe... i havent created much stuff since the new template

Yeah, that's the way it used to be. Now you do that and the system has a customer friendly pop up that says, "Hey you a-hole, you kiddin' me? You loaded a real-time template, fool! Go waste 5-10 minutes to fix that some."

Actually Gui is not difficult to overcome this problem: when you create a game you can customize your own templates, so you customize it in multi day, saving it as a new template, and the work is done.
It is a thing that should be fixed in any case, but in this way you don't have to spent 10 minutes but 1.
This legal consulence will cost you some bucks.

This is a bug -- I'll fix this in the next update. Thanks for reporting it.

However, you don't need to re-make the entire template. Trilussa is correct - you just need to flip it to multi-day via the game creation then go back to tournament creation.