I am assuming an in-game ticking clock. Solve X puzzle within a time frame... or rescue Y before dawn on the 5th day etc...
Most general adventures won't have a time limit per se. The adventure just takes as long as it takes. My 1e group is exploring an underground complex, for instance, and there's no rush or imperative. They go in, explore, map, etc... retreat to their camp to rest and plan the next day's exploration. Classic expedition style.
If you're referring to an IRL time frame, well, yes, we usually schedule our games around a 4 hour session.