How often do you need to shave your legs/arms to keep them relatively smooth? How long have you been on HRT, and has that affected hair growth?

I'm in the process of doing laser for my face and the results have been AMAZING, and I'm considering looking into other areas as well. However, I don't really know if doing legs/arms is "necessary," and if shaving often would suffice.

I know like all trans-related things, "your mileage may vary" - but I still do want to see what other people have experienced.