Thank you very much for you reply. In fact I do know that research consumes energy and time, sometimes becomes very frustrating due to the speed of the results. Additionally it sometimes even require more commitment because usually we work in our own rhythm, while in the industry somehow even in the R&D there is a schedule and process slightly repetitive. I'm really inclined to take the PhD in terms of passion although fearful about the acceptance for someone without local experience and maybe too old. Talking about this, as Australia has a good number of immigrants each year, is it common for ppl start in the industry in their mid 30''s?
What I wanted to say about resting is that I've been studying and working (both simultaneously) for a long time already. Sticking with just one of the activities would really be beneficial, specially for my health.
What is your industry? Why did u persuade a PhD? Is PhD a requirement in your field for the most prestigious positions?