blocks per interested time is blocks/hour or blocks per 24hr or whatever timeframe you are trying to figure the reward in.   net hash / your hash = your share ( 1 out of XXXX). then take coin amount per block and divide that by your share. Multiply this number by how many blocks/hour the pool is getting on average. then you can multiply the hour average by 24 to get your per day earning estimate.

so lets say the network has 1.9 TH and my miner puts out 2.3 GH.  1,900,000,000,000/2,300,000,000=826.08.  so I get 1/826th of the block reward. lets say block reward is 25.  so 25/826=.0302 per block in the pool. multiply this by how many blocks per hour the pool finds. lets say they find 25 block an hour. .0302 x 25 = .7566/hour. then multiply the hourly earning by 24 to get a full day estimate.  .7566 x 24 =18.15 coins per day estimate.

Edit -  obviously you will want to compare more than just one hour to get your pool's average blocks/time. your pool may have had a good or bad hour of couple of hours. always check your block times and hashrate of your pool frequently.