A 1x liquidation preference (meaning investors get their money back before employees and other investors “below them in the capital stack” get anything) is most common. A 1.5x preference is less common. A 2x preference is rare in VC (more common in growth equity). Anything more than that is extremely rare, and a startup that was hot at the time (meaning multiple investors were competing to invest) would likely not give investors anything more. A 5x pref is unheard of. There are other types of preferences too - google “participating preferred stock” to learn more.