how to set availiable time per day to 8h?

The output of month command gives such a summary at the end:
```
$ timew month
...
Tracked 93:31:12
Available 626:28:48
Total 720:00:00
```

Is it possible to adjust it so that timew counts only 8h per day, but without limiting the calculation to defined values like 9:00-17:00? My work schedule is very flexible and I'm only interested in the amount of work I need to do until the end of month and how many hours in month are there.

Is there a config to change 24h per day to 8h?

Start with the `timew month` command and the availability calculation, then inspect how configuration is loaded. The change would be complete when available time can be calculated as 8 hours per day without requiring fixed hours such as 09:00–17:00, and the month summary reflects that setting.

Written by the indexing model from the issue text.