Time until completion logs are useless

Such kind of logs can be found in different scripts (parsing, preprocessing, vocab calculation etc.)
```
INFO:root:Time elapsed: 568.12 s, estimated time until completion: 97.
```

Although they are fine if the execution starts from the beginning if the task has been interrupted and restarted, the predicted time is far ffrom true.

Start by locating the time-estimation logging in the parsing, preprocessing, and vocab-calculation scripts mentioned in the issue. Check how restarted executions derive their estimate, then verify that the reported completion time remains accurate after interruption and restart.

Written by the indexing model from the issue text.