What is approximate duration of taxi ride, hangzhou to pudong airport on Monday 7am and cost please?

Generally speaking, it takes 2 to 2.5 hours on the way at that time. The fare is CNY 800 to 1,000.
Or you can take the earliest high-speed train from Main Railway Station to arrive at Shanghai Railway Station (06:10-07:36). Then take a taxi, airport shuttle or subway to the airprot directly. In this way it saves you money.

Thank you for the indication on taxi cost. Will explore the high speed train option then.