how long did it take for ads to show in blogger.com?

First of all the adsense ads don't just show up after being approved you need to embed the code from adsense to your blog this is how you get the codes.

go to your adsense account and sign in and open an extra tab then sign in to your blogger account once you do that you will need to go to your adsense account and go to adsense setup once there go to adsense for content then go to edit the ad that you want to put on your blog and then just get the code then copy and paste it into your blog.

to paste it into your blog you need to go to your blog then go to layout then make shore you are at the page elements and if your gadgets are on both sides decide where you want to put your ad then just click the add a gadget then go to the html/javascript and click the plus sign once there just paste the code into the box you do not need to have a title on there once you are done just click the save button and then preview it to see if it worked sometimes it takes a little while for the ads to match your site...

God Bless and Good Luck...