Running a small little research around here. For example, Bitcoin has (or will have) a total of 21 million coins, tops. Litecoin seems it will have up to 84 million coins, total.
In your opinion, when a new altcoin is created, how many coins is just too much? I have seen projects with like 10,000,000,000,000 coins. That looks almost like... a spam coin :/
This varies greatly, the amount of supply for most Projects cannot be described. there are projects that provide little supply and there are also projects that provide a lot of supply. However, in the majority that most altcoins have a very large amount of supply.