DPL and HPL have different expansion values.
For DPL the maximum length without expansion profiles is 10 m. The expansion gap should be 8-10 mm.
For HPL, the maximum length is 15 m and the expansion gap should be 4-6 mm.
For all laminates: in doorways, room transitions and if floors connect asymmetrically you always need to install expansion profiles.
Laminate floors are to be installed as floating floors so you should always leave an expansion to walls and any other fixed constructions so that the flooring can move.