Yes, I think so. I am a bit more along in recovery, but at 8.5 months I was the same as you. At work I did pretty well if I was able to walk and sit intermittently (and throw my leg up on a desk), but standing for long periods got to me. The same thing would happen at home, like the weekend I decided to paint all the exterior trim on my house BY MYSELF, lol.
I'm going to throw out a weird tip for your consideration: at work it helps me to sometimes kneel into a sturdy (non-rolling) padded chair with my TKR knee, and/or utilize a small step stool to stand with my foot up like a pirate. In either case I hold onto something -the chair back or a wall- for support. The pirate stance might not be appropriate depending on your attire and the circumstances, and of course you wouldn't want to fall. I just find it helps to vary my position.
P.s. I am doing better with prolonged standing now (10.5 months). You will, too.