*own

I agree with eliot. There is no real difference. How much time will it take? How long will it take? They have the same meaning. 'how long' is shorter and I think it sounds slightly more natural.

No difference.

How long will the football match last? How much time do you need to finish the work?

I think " how long" is more appropriate to say than "how much time", in english "how much " is referring to a money.... :) (that's my on opinion)