Squigglyruth
Planter
I do sometimes spend time with the game paused whilst I work out what crops to buy etc. - that probably adds up, but also probably should count towards playing time :-) Also I have definitely paused during dinner a couple of times - but not often...That's a huge amount of time! I definitely have the same thing though, Steam says I have over 400 hours, but I actually only have a bit over 200 hours of playtime, so I obviously spend a lot of time afk or with the game paused in the background.
How did you work out how long your playtime is? Did you add up the times from your farms? I would be curious to see whether my ratio is is similar. I am really surprised by the number of hours that I've clocked.