We recommend building quality links gradually – it is a slow process. If you get a huge number of links in a single day, you may well be drawing attention to yourself.
If you’ve bought those links, you may not get the benefit you expect. However, there are legitimate ways in which you can get a large number of links in a day – a breaking news story for example can result in hundreds of links in a day. So, I wouldn’t worry about that at all.