asyousuf, how much time do they give you to land once they issue the visa? it seems like you can wait for more than 6 months.
As per law, one year after the date of medical examinations.
I had my medicals on 19 June 2010 but visas issued on 24th August 2010. As a general rule of which ever is earlier, due to early expiry of passports i.e.24 May 2011, i have to do the landing before that date. If my passport were expiring in July 2011, my visa would have remained valid till 18 June 2011.