How far is 27km bike ride?

Depends on bike, riding conditions, fitness level and degree of determination. On flattish roads I can probably do it in less than 2 hours, a dedicated road rider may do it in just about one. Someone else might need more than three.
Depends on fitness level, how hard you're trying, what bike you're on and general riding conditions. There are those who could do it in about one hour in good conditions. I could probably do it in about 90 minutes. Many would need about two hours, and some would be in around 3 hours.