PBeM game length (in real time)?

[Imp]

My main concern is that I will start to 'lose the plot' if I don't remain actively engaged in a battle.

I understand what you mean firstly it makes the battle more engaging keeping the flow if played regulary, for me over 3 days l lose the flow of the battle & have to think what I was doing trawl up from memory where that ATG fired from etc. Inevitably you forget something & get caught out because of it. Becomes trickier if have several games on the go but I would rather limit my playing so I can return turns pretty much when I get them. Luckily 1-3 day returns seem to fit with most peoples lives & in my experience 5-7 turns a week is the norm. If you share the same time zone can sometimes be higher.