Faster printing is attractive because a desk duck is small and you want another one. Speed is also how eyes close and bills sag. Raise it in pieces, on the parts of the print that are not the face.
What can go faster
Infill and inner walls can usually move faster than outer walls. A display duck does not need dense infill. A lighter infill shortens the job without touching the shell people see. Top surfaces and the outer wall should stay slower until you have a sample you like.
Travel speed is a separate knob. Faster travel can reduce strings if retraction is already sane. It can also knock a small duck loose if the bed adhesion was barely enough. Watch the first few layers before you leave the room.
What should stay slow
The eye band and the bill. Those layers are small, hot, and easy to blur. Many slicers let you slow specific layers or use a minimum layer time so a tiny layer still has a moment to cool. Use that before you buy a new fan.
A first layer is never the place to chase a benchmark. Elephant foot gets worse when the nozzle is rushing and too close.
Cooling and temperature
More speed needs enough cooling to freeze the outer corner, and enough temperature that layers still stick. If you raise speed and see splits, you went too cold or too fast. If you see shine and mush, you are too hot or under-cooled. Change one of those, reprint the head only if your slicer can cut a test, and compare it to the baseline print.
Multicolor is already slow
Color changes dominate the clock. Speeding up the yellow body by twenty percent does not fix a purge routine. Read multicolor before you tune speed on a five-color job.
Keep a named profile
Save “duck, careful” and “duck, faster” as two profiles. The careful one is for a new theme and for anything you will photograph. The faster one is for a repeat you have already checked. A single profile that you keep editing is how last month’s good eye setting disappears.
No article can give you a universal millimeters-per-second number. Your printer, filament, and the size of the duck decide it. Time a print you are happy to look at. That time is your real speed.