Unlucky with the coins?

It is now the sixth day I have pokemons in gyms and haven't receive (0) no coins as the reward although I am "defending" 810 hours. I am completely lost with the understanding this game which going to be one year I am playing it. I tried some raids but so far even playing in a town of 10K people nobody joined at 3, 4 raids and raid 1,2 are boring. I lost the challenge.