A single-layer Blu-ray is about 25GB, so 22GB isn’t too out of the ordinary. If your PC is nearing 10 years old, space might be an issue.
A single layered Blu-ray disc is exactly 23.3GB. I buy spindles of 50 of them in the 6X option quite often. Faster to burn and verify through IMGBurn compared to 4X option.