Working on a new feature is always a good learning experience. One of the learnings today was the need to set better default values.
Could the user accidentally stop a timer before 1 minute? Not many would want to record time less than a minute. Rather than display an error message, it would be better to automatically update the timer entry to a minute.
The default theme, font, text size and so many other decisions you take when building your product end up making a big impact on end user experience. Not many would look under settings to change these values. Good to have an opinion about the default choice you decide on.