What is a better time to talk?

Help me, please! I am writing to my new friend. I have time for a talk (to talk) with you around 10.00 a.m until 20.00 p.m вy Moscow time. (в нашем разговорном языке также принято сказать: from approximately ten until eight.)

How much (much употребляется для неисчисляемых существительных (без мн. числа), а "many" с словами, у которых есть множественное число.

1. How much luck have you had with the post office?

   "How many pieces of cake have you eaten?" asked his envious younger brother.

2. There was much sorrow in the Jones family since the murder of Father Jones.

    There are many signs of decay in the American empire these days.

3. I was one of the many people (no "s" placed here. People is the plural of person) who got a free iPad. ) time do you have today? At what time do you prefer to talk? Is it OK? 

Thanks a lot.