I think that the reason why you haven't got an answer is because there isn't an official timescale to process an Irish spouse visa. The INIS website says that: 'Applications can take up to 12 months to process. Applications are dealt with in chronological order of receipt.'
http://www.inis.gov.ie/en/INIS/Pages/WP07000024#Howlong
I have read of people waiting 4 to 6 months but, as it says above, it can take much longer.
Have you considered moving to the UK with your spouse through the EEA regulations? I don't know if it suits you but it would be processed much quicker than the Irish spouse visa. You can have a look through the regulations here:
https://www.gov.uk/family-permit. Just something to thing about. It won't suit everyone.