This just sounds like "context switching" is your problem (I have the same problem where I work), instead of the number of hours you work. That's a well know p

This just sounds like "context switching" is your problem (I have the same problem where I work), instead of the number of hours you work. That's a well know productivity killer for programmers. If your job is flexible about the hours you work I think that's a separate issue than what's discussed here. Work late and come in late the next day or come in early and leave early. Maybe there's a few core support hours in the middle of the day where you need to be reachable for meetings or something. I'm thinking about trying to implement a "quiet time," an hour or a few hour window everyday where you can expect some radio-silence. Even if it's once or twice a week I think it'd help.