pippin88,
Not really doing "passes" in the curved area, on the straight spots yes I did (and I took about 1/64" to 1/32" on each pass), but I found that because my mill functions like a drill press I decided to try something new (for me at least).
I drilled one hole at the beginning of the passage on the right (has to pass through to the front side) and then from there moved about 1/32 of an inch into the path and milled straight down, cutting just a little from the side of the starter hole with the endmill.
I found I could remove material MUCH faster this way without the lateral forces and risk of snapping my endmill.
In the end I think it took about the same time, but again less risk to the endmill and easier motion on me as I was not cranking on the table so much. (Just slow ΒΌ turns to advance the table and pull down on the handle to cut, then back up, rinse and repeat
)