It's not Please Marry My Boy alone that does it, it's a knock on effect.
Today Tonight makes Home & Away 5 minutes late, which makes My Kitchen Rules minutes late, which makes Please Marry My Boy 25 minutes late, which makes TAR unbearably late. MKR always runs over by 10-20 minutes, it's pathetic.
Channel 7 has to fix this - either be more restricted with editing, or have less ads. But it should get better before TAR Aus starts as both MKR & Please Marry My Boy end next week.