Friends, it's simple arithmetic. If 4 players constantly spend even 4 minutes per turn (and in manual battles, it can be even longer), then in total, a turn will take 16(!) minutes. In a gaming week, that's 112(!!) minutes. In a month, it's 448(...). That's 7.5 hours. For some gaming month... it's not even funny.
And then, notice, I didn't write "forget about these manual battles." I myself don't like skipping battles and I feel bad about every lost unit. But time is more valuable, especially when playing online.