Dublin has a big problem with 3rd spaces; no cafe is open for anywhere close to that, and we are all basically shoved to pubs..
I used to sit at cafes pretty late with a laptop — buying multiple ( >= 2 ) cups of coffee, often salads and sandwiches — in the countries I lived in, but there’s none of that in Ireland. Most non-chain cafes are not open past 17; and chains go on until 20.
British culture in general is pretty bad in this regard. Even in Central London, I find Leicester Square to be the only place that's a little alive at later hours. The pub culture, which I also like, might be to blame. If you start drinking at five on a work day it's pretty easy to call an early night. (there a lot of great third places if you stick to regular early hours, like the cafes of many of the museums.)
Germany I find even worse though. It's kind of ironic since they seem to have a more robust nightclubbing culture compared to the Brits.
I used to sit at cafes pretty late with a laptop — buying multiple ( >= 2 ) cups of coffee, often salads and sandwiches — in the countries I lived in, but there’s none of that in Ireland. Most non-chain cafes are not open past 17; and chains go on until 20.