My version took about 11 hours.
The dpns I used were big for the yarn, but I went up a size from perfect gauge so baby doesn't outgrow it before fall. In hindsight, following the pattern and sewing arm seams might have been quicker too. I chose to 'simplify' things and knit them in the round after finishing the body.
Also decided on ties instead of buttons, and those took 2 tries. The FO has 2 st i-cord; the 3 st I tried first was too heavy looking for the sweater.
Can't wait to see my new nephew in it.