Campaigns without Downtime
Source GM Core pg. 45
There are two ways you might end up with a game that has no downtime: no time and no interest. In the first, the story moves along so quickly that the PCs don't really have time to engage with downtime. Think of it like a breakneck action movie, where the characters barely have time to breathe before they're on to the next challenge, and even the end of an adventure is a cliffhanger.
In the second, you and the other players just don't care about downtime at all. It doesn't interest you. In this case, just summarize what happens between adventures and skip using any downtime rules.
If you skip downtime, you might not need to adjust your game. The money PCs can earn during downtime is minor compared to what they can gain through adventures. However, the PCs will have less choice in what items they get if they don't Craft or earn extra money to buy items.
In the second, you and the other players just don't care about downtime at all. It doesn't interest you. In this case, just summarize what happens between adventures and skip using any downtime rules.
If you skip downtime, you might not need to adjust your game. The money PCs can earn during downtime is minor compared to what they can gain through adventures. However, the PCs will have less choice in what items they get if they don't Craft or earn extra money to buy items.