The HDMI standard specification does not define a maximum trace length, it just defines impedance, so it can be relatively long unlike DDR for example when it’s much more constrained.
From what I understand that trace length should nor cause problems provided that the impedance is correct. I would also check the HDMI standard for more guidance and as with any trace it’s important to make sure that the EMI is controlled by having a ground signal parallel to the signal trace.
