I think I got it. It's probably closer to 45 seconds, if read in Mask of Light's grandiose style. Something I thought would be good is to have the full thing play for the first episode, as a way to introduce the story. Then the shorter version plays for the rest of the episodes as a refresher. I'll list the full thing here. Parts in bold are the short version. (Note: the last part is something Kahi came up with way back.)
In a time long past,
The Great Beings created the Island of Artakha.
These brothers made it a prosperous land,
Filled with many beasts, and sustained by great elemental energies.
Such energies required balance,
So the brothers created guardians to protect it.
The Elemental Gods.
One brother wanted more, and a new species was born.
This was a fragile race,
But in exchange for fortitude, they were given something more.
This caused a rift between the brothers,
Beginning a battle that shook the Island to its very core.
The Gods saw this destruction and looked to regain balance.
They rebelled against the brothers,
Sealing them away with manifestations of their elemental might.
The Island was at peace once more, and the Matoran thrived.
Stories spread among this young race.
Legends of the victory against the brothers.
And legends of the elemental manifestations, known as the Toa.
When times are dark, and all hope seems lost.
Those who call upon the spirits of the elements,
if they be worthy,
Shall bear the power of the toa.