I've just launched latency.at and I've started working on it about a year ago but in the beginning worked only a few hours per week in my spare time on it. In the past months I put more time in it while freelancing the other days. And yes, I felt exactly the same. The core piece was literally done in a day, but everything around it took forever. Happy it's "done enough" to finally launch it. But now the next hard part: Find (paying) users.