Higher exposure times can cause increased light bleed in less pigmented resin, but probably won’t have any such side effects for resin as pigmented as yours appears.
If you ever try printing on bare silicone, higher exposure times will also increase the rate at which the silicone wears out from reacting with resin (the clouding effect described for most other non-film silicone SLA vats). This is not really a concern for stock Kudo3D PSP vats though, since the film above the silicone is quite tough and will protect the silicone layer from this effect.