It can be enjoyed casually solo or with close family like a girlfriend or teenage kids. But with friends you need to schedule long sessions because it’s a huge game. It has 3 difficulties: explorer, balanced and tactician. So a solo explorer play through could be done casually in 30 minute chunks. You might have to pause mid combat during longer fights but it has quick save so you can finish it later.
This is the best answer that we should strive towards. Deduplication and community combining. Deduplication is hard but a lot of other places have been attempting it for years so methods have already come a long way. Community combining could be done through partnered aggregation and tagging of communities