Yesterday, I bumped into a friend of mine. While conversing, he told me that he goes to a center. Then I asked him which center do you go? (to. Should I add "to" or not?) then he told me the name of the center. Then when I asked him how long do you spend at/in the center?, he told me, don't use "how long" with "spend". Use "how much time" with "spend".
While looking it up on Google, I came across a website. On that website a guy mentioned the same. Now I am confused as to which one to use?
So now I am asking you guys which one is correct?
How long do you spend in the center?
How much time do you spend in the center?
Any help would be greatly appreciated.