Canson artbook, 10,2 x 15,2 cm (4 x 6 in), 96 g/m2 (65 lb). It took me 3 hours, although it felt much shorter.
The paper is almost too thin for this medium (the paper warped), and a bit too small for this level of detail. I’m using a set of 30 acrylic paint markers from Artistro that come with a fine tip that is 1 millimeter wide. At this scale, one millimeter is pretty thick. I find that thinner lines can be achieved in swift strokes, but that is at the cost of precision (in my case).