Hi Mike,
That thought would never enter my head.
If someone started a WIP 10 years ago - and them decided to take it up again - or post a final completion pic 10 years later - I would just think "Cool ! - They finished !"
If anybody thinks "Whoa - that took to long - he shouldn't have done that" then that's their problem. I think the great majority of us would still love to see your work.
I just like to see people's ideas and craftsmanship come to fruition - who cares how long it takes.
Chris