How long is ebays limit?

So I bought some stuff off ebay for the first time I always use amazon and I had to get my friend somethimg and her thing was at the bottom of my watch list and there was 5 others and I bought the 5 things and everything went slowly then to go buy her thing it says something about limiting the buying how long will this go on for? Shes expecting her stuff and it doesmt seem nice I bought all my stuff and didnt get hers so how long before I can start buying again? An hour, 24 hours?