The Grand Bazaar is one of the largest covered markets in the world. It is huge, a maze of 61 streets and 3000 shops! Some guide books suggest spending several hours here, which you could, however we felt an hour was enough to walk around just some of the many streets. This gave us a flavour of the bazaar and we were able to enjoy the bustling atmosphere. The Bazaar is very busy with tourists exploring, as well as locals enjoying Turkish tea. There were lots of shops selling lamps and carpets as you might expect so it is the place to come if you are looking for a souvenir. 
Tips
This was the busiest place that we visited in Istanbul so may not be suitable for those who dislike crowds.
The Bazaar is split into sections such as leather or gold. Take a map of the Bazaar with you so that you can try to locate the areas you wish to see most.
As with any crowded place pickpockets are a risk so take a bag which can be securely closed.
Take your camera as there are some excellent photo opportunities, you can take some beautiful photos of the lamp stalls.
https://www.tripadvisor.com/Attraction_Review-g293974-d294496-Reviews-Kapali_Carsi-Istanbul.html
The colors and editing of these photos is marvelous!
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