Half a roll??? Are we talking Andrex or cheap 300 rolls for a quid toilet roll???
If its decent quality...... I'd possible say, NO.... It's not normal unless you have an a*s the size of Russia!!!!!!
When my eldest daughter was still living at home I could never work out why we used so much toilet roll,when she left home it was obvious it had been her using it as the amount I had to buy dropped considerably.A couple of years later she confessed that she had been eating the loo roll to make her feel full up so she didn't have to eat food that would make her put on weight :( Some of the things anorexics will do to avoid eating are quite shocking!