IRS Tax Return Intercept: I am trying to figure out how tax intercepts are calculated. I.E. - is there a max % that can be taken, how do I find the total amount, etc.

I am positive that I am set to have intercepts done on my Tax Returns this year. I have some (minor) past due child support, court arrears/birthing costs owed to the state and I am currently delinquent on my student loans. I have never had tax intercepted for any reason, let alone 3. I have a few questions in regards to this so I have an idea of what to expect.
1)Is there a maximum dollar amount or percentage of total refund that can be intercepted? or can the IRS take my entire refund in attempts to pay these dues?  

2) Is there a way for me to find out the total amount being intercepted?

3)Does the interception delay my refunds to be deposited to my account, and if so, approximately how long should I expect the delay to be?