47 min is about right for any engrave that size depending on the LPI . The trace feature is limited but folk are correct about the white paper hiding the background. an erasable marker could easily highlight the edges and make them stronger. If after you made the scan, you removed the artwork and paper to replace with PG acrylic it should do the job.
Alternatively if you used a cellphone camera, and brought it into a program like Inkscape you might be able to do a lot more with it.
Going through the training guides and making yourself some bed pins to hold things down would help as well.