Because a determinate prisoner is released at the half way point in his sentence, a life sentence with a minimum term is the equivalent of a determinate sentence of double that length.
On Wednesday Bush explained that the relative level of violence is not a determinate of victory or defeat because the enemy can use cease-fires to rearm.
In the case of a determinate sentence, a prisoner is generally entitled to be released from prison on licence having served a specified percentage of his sentence.
Shahjahan, now 29, was given a new determinate sentence of 17 years and eight months and he must serve half of that before he is eligible for release on licence.