There is no such number. You can have a lot of links in a day but that should be justified enough so that google should not see it unnatural. I would suggest, just do what you can on your blog. get engage in some bog commenting, direcotry submission, social bookmarking and whatever you can do. Now of course you cannot do this at one day. You will have to first make a plan of you overall link building strategy. I would suggest you 20 to 25 quality links per day and don't forget to update your website content at lesat thrice a week...
I just sent around 8,000 to a new site the last few days, mostly all from unique sites with PR. Does not appear in search engines as I expected. Pretty safe to say that might be a dangerous amount!
25 to 50 backlinks per day is good enough. Not all this sig file links that you created are indexed at the same time. It may even go for days before some of them are indexed so it doesn't look like you have 50 in one day. Thanks Shelly77
For the first 2 months while you don't want to end up in the google sandbox, I would build 2-5 links per day. After that, you may increase to 4-6 inbound links per day. Most backlink building services will not exceed these services and they know pretty strongly about SEO.
well there is no maximum per day but it needs to look natural and not automated or out of control...personally I do 10 per day every single day of the week...it is working very well for me with lots of first page rankings...I have been doing it for about 10 months now...over 2,000 backlinks to my site now..and a PR 4 since January...not bad