Into what immense timescale do the predicted main-sequence lives of M-type Red Dwarfs extend?

Trillions of years

Red Dwarfs, classified as M-type stars, are the smallest, coolest, and least massive stars in the cosmos, embodying the concept of stellar endurance. Their extremely low mass results in significantly reduced core temperatures and pressures compared to stars like the Sun or O-type stars. This suppression of internal conditions translates into an extraordinarily slow rate of nuclear fusion. Because they consume their hydrogen fuel so sparingly, their predicted main-sequence lifespans are unparalleled, stretching out into the realm of trillions of years. Given the current age of the universe (about 13.8 billion years), every Red Dwarf ever formed is still actively shining today.