The first campaign took me 9.5h according to the in- game clock but I believe only counts battle time so it should be 10-11h real time.
To get the 100% you have to beat every mission on the map. There is one that's hidden. Rank and score is irrelevant for 100%.
Playing Advance Wars. I finished the first campaign couple days ago and now I'm trying to get the 100%
I use Obsidian in the work laptop because they don't allow any cloud tool for confidentiality and I like it a lot.
For personal stuff I've been using OneNote just because its free and has clients for almost every system I use.
If the want to keep on the "freedom" route they could add mechanics to destroy/build the scenario. Destroying rocks in some TOTK caves gave me Minecraft vibes. They could allow players to dig anywhere. Also they could generate the world procedurally so we'll move from the current each player experience Hyrule in a different way to each player actually getting a different Hyrule.
I personally don't like much the Zeldas on the Switch. I'd rather get a more classic Zelda that follows the item-dungeon-item-dungeon pattern.
The games that I play almost every year are: Tetris (Game Boy), Super Mario Bros (NES), Chrono Trigger (SNES), Commandos (PC), Duke Nukem 3D (PC), Portal (PC).
I've had an iPhone for a long time and I've never got a person sending me a SMS. All I get are automatic messages about deliveries and stuff. I guess iMessage is more a thing in the USA?