I work full time and am currently studying for module 1 of the ATPL's. I am putting in around 12 - 15 hours study per week and have to say I have surprised myself with so far (but no doubt that can change at any time) with how much I have got through. I am aiming to have them complete within a year and then take 3 - 4 months off work to complete the CPL/ME/IR.