There have been recent advances in paint technology that have resulted in a few products that will do both jobs. This bath took six rolls last time. There are several variables. The pattern repeat and the match will have an effect on the amount needed. With a different repeat or type of match than last time, there may be more waste, requiring a greater amount.
Different companies package their product in differently sized rolls.
There have been changes in manufacturing standards in the last few years that have decreased roll sizes. Needing more rollage than was needed for the same space a few years ago is becoming very common. A solid sheet vinyl will be best for these areas, preferably one with a canvas or scrim backing. Paper backing may work fine, but if the backing absorbs moisture, it may begin lifting or delaminating. For other areas, a wider range of wallcovering will be acceptable.