To ask if you think a 3 yr old....

[PinkAndViolet]

Can walk 20 minutes easily enough or is it too far?

Depends how far you need to get in the 20 minutes.

My DS has just turned 3 and will walk for several miles no bother. My older DD was never like that, would whinge and whine at that age (still does a bit!). I think it’s really variable.