It's getting pretty close to dangerous, tbh. It's not quite "critical" but it is to the point where you should be considering either other cooling methods, a different environment, a cleaning, or repair.
Yeah. And do keep in mind that laptops are prone to get hot with prolonged use, anyway. At the end of the day, laptops are just generally weaker. It may be normal-ish temp for a laptop, and I am unsure how cleaning would work.