But more people are out and about in the evenings and the time in the evenings could be used more productively by most people.
I used to work 8am - 4pm and get up when it's dark from the start of Oct until the clocks change and then from mid-Nov until the end of Feb. Around 4½ months.
I'd get home when it's dark from the start of Nov until the end of Jan. Around 3 months.
If we used one time zone all year round then I'd get up in the dark from the start of Oct until mid-Mar, which is 5½ months, but I'd get home every evening when it's still light.
I used to work 8am - 4pm and get up when it's dark from the start of Oct until the clocks change and then from mid-Nov until the end of Feb. Around 4½ months.
I'd get home when it's dark from the start of Nov until the end of Jan. Around 3 months.
If we used one time zone all year round then I'd get up in the dark from the start of Oct until mid-Mar, which is 5½ months, but I'd get home every evening when it's still light.