Trekking on my Trek 3700 with disc (2011)

So I bought a mountain bike last month. I've always wanted another bike for a long time. I've been riding it nearly everyday, atleast 4 days riding back and forth from school. It is 3.9 miles according to Google Maps. So I ride about 7.18 miles atleast 4 days a week. I don't know if that is enough for my journey. Only time will tell