I was denied from few schools and it has been 2 weeks since I sent appeal letters to schools and still not getting an email or anything. When do universities respond to my appeal letter?
Many will not respond. Quite often there is no appeal process.
You have been rejected. Don’t expect anything. Appealing would have an even lower chance than admission.
What are you appealing? Unless you believe that a clerical error occurred, you need to move on.