I just saw a documentary on Hadrian's Wall and it was completed surprisingly fast.
6 years of part time work by about 15000 men (3 legions).
This wall seems to be less complicated (no cement), but a bit more material (trees vs rocks) and similarly labor (excavation versus stonework) intensive.
I suppose it would depend on over what period of time the wall was constructed and how much man power could be dedicated.
Given a wall with gaps would not be nearly as effective as the full one and this construction does not seem to be incremental in nature. (Ie with stones you can make the wall higher over time.) I see the construction time running no more than 20 years before you have serious issues of people wondering if it is worth the effort.
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