阅读短文,Amy'mother bought a new bike for her.The bike is very b

阅读短文,
Amy'mother bought a new bike for her.The bike is very beauti-ful.Her friend Mary likes it very much.
Mary:Where did you buy this bike?
Amy:My mother bought it in the supermarket.
Mary:How can I get there?
Amy:I'm not sure.
Mother:You can take the No.5 bus to go there.
Mary:Is it far from here?
Mother:Yes.Maybe it will take 20 minutes by bus,and you can get off at Renmin Hospital,then go straight for 2 minutes.The supermar-ket is on the right.
Mary:Oh.I see.Thank you for telling me.Can you go with me now,Amy?
Amy:Yes,I'm so glad.
Questions:
(1)How long does Mary go there?