Is it correct that OneOfTheseCanBeSaidOnce is being used for both, or does a valid utterance for this grammar actually have to be OneOfTheseWillBeSaidOnce (meaning they are both required)? Having them both be OneOfTheseWillBeSaidOnce will reduce the number of variations a bit. Another thing that might help is reducing to 72 rather than 100, since none of those time measurements (hour, minutes, seconds) are generally dictated in numbers larger than 72.
I would also consider dropping the SECOND/SECONDS plural variations since it doubles the grammar size.