Hi, I agree, its, in my opinion, far too much to take on, both will suffer. Are you planning on doing them both as full time study - if so then imagine whether you could do two full time jobs simultaneously, long term, and how you would cope - you wouldn't. Don't underestimate the workload involved in a PhD - its vast! Then you have to try and manage two different sets of timetables, deadlines, work styles, etc etc etc - utter nightmare. Whilst I completely understand your concerns over the timescales and the need to get on, you may well do yourself and your research a huge disservice by trying to combine 2 very demanding post graduate degrees at the same time.