Bed heat up time seems very long

I’ve been noticing that the time for the bed to heat up to 70 C before printing can take as much as 5-6 minutes. Note that my Snapmaker 2 A-350 is in a Snapmaker enclosure, I do not have cold air blowing at the machine, and the temperature/humidity inside the enclosure is 80 F / 50%.

I just wanted to know if 5-6 minutes is normal for the bed heating process, or if I may have an issue?