Lasting Breath
(Alteration)

Range: 5 yards/level
Components: V, S
Duration: 1d4 rounds + 1 round/level
Casting Time: 1
Area of Effect: One creature/level
Saving Throw: None

 This spell increases the amount of time  character can hold his breath. As described in the Players Handbook,  a character can hold his breath for a number of rounds equal to one-third his Constitution score. The effect of this spell is added to that figure.
 The duration of the spell is always unknown to the recipient; the DM secretly rolls 1d4 to determine the exact duration. At the end of this time, the character must succeed a Constitution check or be forced to take a breath as per the rules.