How long does it normally take for requests to get filled? (just out of curiosity)
Purchases or the custom requests in the list? Custom requests, at least in coding, are given high priority and put before any normal requests in the request board and before SZ updates, excluding major bug fixes. So, pretty fast.
Purchases are completed when I have time (if they require updating something in the coding.) or right away (if they're stuff such as karma).