One layer high (0.2mm) loop pattern covering the entire Prusa XL print bed.

“Prusa XL First Layer Test 2.7mm r1” - 2.7mm wide loop.  Print time ~8 min with 0.4mm nozzle.

“Prusa XL First Layer Test 5.0mm r1” - 5.0mm wide loop.  Print time ~14 min with 0.4mm nozzle.

Scale model in slicer for other layer heights or for multiple layers.