I bought 10 of them last night, I still haven't gotten them. In the past they usually arrived in about 20 minutes to an hour.
something must have been up on their side because my main auto subbing account that has been subbed for ages suddenly went FTP.
It can take up to 72 hours for Krono to appear on your account (it says so right on the page I believe). If I buy a Krono around the weekend, it definitely takes that full 72 hours (and maybe a bit more) for it to show up. If it still hasn't shown up after 72 hours, then I would start bugging customer service.