I Have Bursitis In My Knees (a Bit Swollen, Sensitive)

I have bursitis in my knees (a bit swollen, sensitive) from prolonged kneeling recently, not a common for me at all. Will swimming help to relieve symptoms? And how much swimming should I do, I was about to start the new year routine of twice a week, half mile of breast stroke, can I still do this and will it help please?