I had 15 minutes and spent a bunch of that time asking clarifying questions about the structure of the logs, how big the logs were, was this a one-time parsing of the file or ongoing, etc. I also had some difficulty understanding the interviewer because they were not a native English speaker, so sometimes had to ask questions several times to understand their answer. So those issues, on top of the coding in a word processor, caused me to not get very far in writing actual code.