The Blood Of Dawnwalker Time Limit Does Force Players To Rush
Time Passes When The Player Wants It To
Although the game takes place over 30 days and nights, it seems that it won't have a finite number of hours in which players get to go through the campaign. When asked on X, the admin for The Blood of Dawnwalker X account confirmed that the game won't have a hard time limit and won't rush players in their exploration of the world. This seems like the best way to get players to feel time passing without forcing players to run through the game at an uncomfortable pace, although it isn't known how exactly this will work.
After the trailer's release, the Dawnwalker X account has been putting out character introductions for those seen in the trailer, such as for Coen, the protagonist, and Brencis, the main vampire in the teaser.
A good reference for this might be something like the Persona series, where the games are split into days that allow the player to complete different tasks. As the days pass, different events are allowed to happen, progressing the story, although the Persona series only allows for a finite amount of time to do these tasks. It isn't clear whether rushing means that there is indefinite time per day and the player gets to dictate when the next day happens by resting or using some other mechanic to let time pass.
It could be more like how Baldur's Gate 3 treats its days. Rather than a natural day-night cycle, like in Skyrim, BG3 allows players to spend as much or as little time in a single day as they want, and the day only ends by returning to camp to do so. The Blood of Dawnwalker could do something similar, allowing players to do as much as they want before choosing to turn the day to night and letting events in the story happen as a result. There could even be events depending on those days, just like in BG3.