It can be kept in fridge for months,it stays well outside few weeks,if stored properly.
This lemon pickle is an excellent side dish for a simple curd rice or with any thing you may prefer.
The Jar to be stored should be sterilised well so that it stays well for longer.
If you want more sweetness you can,but this quantity itself was more perfect for me.
Its a traditional method but it can be done by boiling the lemon instantly.