I can't agree with most of you. Being an MP is a vocation (almost like a hobby) for many, not a job. They don't do it alone, they have local offices and staff and a web of support in Westminster doing their research and informing them. My own MP for the past 5 years was Tory and lost his seat this year, despite being a very hard-working young man, being replaced by a previously-unknown Labour chap (and the Tory replaced a previous Labour woman who also served for only 5 years - also a hard-working MP.
Many women do two jobs - one outside the home, the other within it. I did that part-time when I had small children but went full-time when I could, plus I landed an extra job that was almost full-time at certain times and was very fulfilling. I believe I gave more than most to each role I performed. There are 168 hours in a week, it is manageable to spent 35-40 hours on each of two jobs and still have time for family, relaxation and sleep. Lots of people have fulltime jobs and also study for extra qualifications. I admit it isn't ideal to spend 20 years like that but it's doable - especially if you enjoy it.
If you are a Minister the workload is probably greater (but more staff to support you) and I feel that an MP who does nothing else is not the best to represent a wide range of constituents without real-life experience.
Anyway, job security does not exist so what does the "ordinary" MP do for a job once he or she loses his/her seat?