How often does Google update it's cache with regards to images found on a website? It seems to always take months for new images I upload to appear in google image search results. When there is an update, I think it does it en masse (ie. multiple sites see an increase in the number images crawled by google). Is that the case? If so, when was the last update???
Well Google updates the image resourse pretty slow, because of many reasons. If you want to see all your images in google you should wait for long time in all cases. About exact time, it i long story and everything takes from 3 month to 1 year This is only what I know
Hi, Here is your answer might be helpful for you. Source: http://www.tareeinternet.com/forum/seo/236-optimizing-google-image-search.html
people claiming the google image bot will come by every 3 months to a year or however long... you're completely full of crap. i am a content writer for a blog and my current job requires a relevant images with each post. i am constantly seeing images from other blogs (that are posting the same topics) get ranked in a matter 1-2 days. google indexes new images for stuff in a matter of days if not sooner. i really don't mean to rant, but i see this same 6 months - 1 year crap from other bloggers writing about the img bot crawl frequency with a lot more authority than they deserve. they're full of crap. they've obviously never specifically tested their own claims. there was a forest fire by my house once and i went and snapped a few pictures of it then hosted them on a blog. in a matter 24 hours they were ranking on the first page of google image results for the name of the fire. i've done this before with more broad keywords just to test how long it takes. in these cases, my images will show up in the results (2nd or 3rd page) also in a matter of 2 or 3 days. so i've seen images rank quickly with domains 10+ years old with tons of seo invested into them, as well as piddly sites of my own that have been in google index for only a couple weeks and only have one post (which just has the images for the test!). google image bot is a work horse and does not saunter by every so many months to a year -- that's completely untrue.