Disc lifetimes (top) and disc-to-star mass ratios (bottom) for discs with varying stellar masses and initial disc sizes. For a fixed disc mass, the disc lifetime increases with increasing stellar mass, while a larger disc also results in longer disc lifetime. Large discs (≳100 AU) around stars more massive than ~1.5 M_⊙ are gravitationally unstable in some regions of the discs. This region is marked by a hatched pattern.