The API Request in question is documented as follows...
cmd=listIntervals - returns all TimeIntervals for a user. Any of the optional arguments serve to filter the results.
ixPerson (optional) - Specifies which user's intervals should be returned. If omitted, list intervals for the logged on user. If set to 1, list intervals for all users.
ixBug (optional) - Specifies that only intervals associated with this bug should be returned.
dtStart, dtEnd (optional) - If dtStart and/or dtEnd are supplied, listIntervals will return intervals whose start date falls between dtStart and dtEnd.
I am issuing the request with a single ixBug argument, but ideally need the request to accept a comma separated list of n case numbers. Currently I have to make n requests to the server and accumulate the responses, which is time consuming.