Hey FF,
You're going to have to do the math. The Provident Fund pays 17% of your salary. Who knows what ROR you can expect. Plan 5%? Your monthly savings depends on how you spend you money. Further to what I wrote above, if you saved an average of $2000-$3000/month over the 7 years, you'd be doing well.
Like we all keep saying, EK is not a make the money and run kind of airline. When I did my own math, it was a minimum 12 year stint to make it worth the move...
BC