That's correct   Though only in this case because the target block reward time is in minutes, more generally it'd be  (<block reward>*<elapsed time in minutes>*<your MH/s>) / (<network block time in minutes> * <network MH/s>). And keep in mind that it's just an extreme simplification to get a rough expectation. After all, the <your MH/s> divided by <network MH/s> portion would only be true if averaged over an extremely long time with a constant network MH/s. And neither of those conditions are true in this case - we're talking about a relatively small sample size and network MH/s is constantly changing. But it still works adequately for a rough estimate.

Yeah buddy - my mistake i think - i have to reconsider ...  :/

Not certain how you're setting your expectations? Just going by the simplest calculation of an ideal block target time of 60 seconds and a 250 FOX block reward you end up with the following for 30 minutes at 3.3 MH/s with a 250 MH/s network speed - 250*30*3.3/250 = 99 FOX per half hour. Now sure, 500 FOX in 4 hours is quite a bit short of that, but that calculation is overly optimistic regardless. Though that calculation matches up pretty much perfectly with your 66 coins per hour at 1.2 MH/s.

I got 500 in 4h at 3.3mhs