As him what date he's been paid through. Like I said, I've been paid today, on the 28th. But my payslip has paid me through the 31st.
If his payslip on the 14th of October has paid him until at least the 18th of October, then you have six months. If it's only through the 14th, 15th, 16th, or 17th, then it's less than six months.
Another way to check is the six payslips he has. If you add the gross amount together, it is exactly 50% of his annual salary?