I work in Healthcare wear an n95 for many hours. I've just had rhinoplasty and will be back at work 1.5 months. Is this ok?

You'll need to ask your surgeon, who should have already discussed this with you preop. N95's are an issue, I'm convinced I've seen at least one patient where they caused a problem, and I had spent a lot of effort making a really solid structure in that case as I knew the patient was a nurse!

I assume that you're asking if you can wear a mask on your nose at work 6 weeks after rhinoplasty.
If I'm correct, that's generally enough time to allow a mask to be worn. However, check with your surgeon for their recommendations/guidance as this is ultimately a decision the two of you will have to make.

I make my rhinoplasty patients avoid glasses for 6 weeks after rhinoplasty.
Masks can be tricky. Some masks, like the ones that loop behind the ears, exert no pressure on the nose and may be fine earlier. I will personally sit with my patients and check the fit of any mask.

Other masks and respirators can significant pressure on the nose and may not be suitable for wear for months after a rhinoplasty.

Bring in the mask(s) to your surgeon and seek their direct expertise.

I would consult with your surgeon regarding tight mask wearing after rhinoplasty. In my practice I usually allow patients to resume n95 mask use/glasses/goggles/etc at the 6 week mark.