When can I shave after laser hair removal?

This question comes up in the days right after a session. Treat it as a timing question, not a yes or no.
Shaving timing at a glance
Wait. SkinMDs gives the window plainly: "Wait 48 to 72 hours (or until redness and swelling subside) before shaving to avoid irritation, infection, and interfering with healing."
Read the parenthetical closely. The clock is 48 to 72 hours, but the source also ties the wait to the skin itself, so redness and swelling that are still present mean you are not there yet.
Why the timing matters
The source names three reasons to hold off: irritation, infection, and interference with healing. Those are skin problems, not cosmetic ones.
For background on the treatment itself, the American Society of Plastic Surgeons' laser hair removal page and the Cleveland Clinic explainer on how it works and what to expect are worth reading before you book more sessions.
What comes next
The next stage is the next session, and the rule flips. WebMD advises: "You should shave or trim the day before your procedure." So the sequence is a pause after one session, then a shave the day before the next.
Plan it around your calendar now. If your next appointment falls inside the waiting window, the shave-the-day-before rule and the wait-after rule collide, and you should find that out before the week of the appointment. WebMD's overview of benefits, side effects and cost covers the same stages from a different angle.
Skin that is still red or swollen after 72 hours
Redness and swelling that have not subsided are the sign. The source gives 48 to 72 hours, and by its own wording the wait can run longer, until the skin calms down. If you are past the window and the skin has not settled, keep waiting and tell the clinic that treated you.
A broader overview of laser and energy device treatments from asds.net helps if you are comparing this with other treatments over the longer course.