I would not advise planning to arrive at an unfamiliar airport 10 minutes before last light for the following reasons:
1. If the weather is marginal - there could be delays or you will be unable to land,
2. If lots of cloud - visibilitiy may be well less than "Last Light"
3. It is a popular time to fly just before last light, circuit might be very busy,
4. What if there has been and incident and the runway is unusable.
There are probably many more factors to consider. (like headwinds, etc etc)
regards