There's no need to worry so much, IMHO!
I'm sure that even if you can determine the completion time of this map down to the day..., the results won't be the same :), and the density of results will only add to the intrigue ;).
However, I think that your editing will only enhance this map :)
P.S. while it's not too late, the map can also be "tweaked" - this will add some zest and possibly attract more players...:).