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?

It should be ok to wear mask after rhinoplasty surgery. However, it is better to check with your surgeon, who knows about your nasal bone stability before doing so.

Thank you for your question. N95 masks apply the pressure predominantly on the bridge and spare the tip through their configuration.
This means that at 1 1/2 months following surgery you should be safe to wear the mask for prolonged periods of time. I am not sure that the mask is effective for five hours so depending on your degree of exposure you may want to check on this.
I suggest using sinus rinse before and after work and for a few months into your recovery as the masks sometimes release some fine particles of their own with prolonged use, and they could be a bit irritating.