Answer:
The best way is to use Auto schedule feature of Hootsuite.
Explanation:
It is possible to manage your posts according to your time selection but it might not possible to detect the best timing to reach a huge amount of users. However, by using Auto schedule feature of Hootsuite it is possible to share posts according to users activity in your account scope so that can reach a lot users and getting more attention to your posts. Well, 15 LinkedIn posts will reach to a large amount of users thanks to great timing posts in a range of two weeks period.