Well, instantaneously would be pretty bad, as it would require either Nokia (and every other repository maintainer) having always available contact info to push data, or continuous polling from the device side; while 24h seems a bit excessive (I changed mine to 2h, IIRC), some interval is necessary, especially for people whose internet access is via limited-data mobile plans.

You can always poll manually at any time, so it's not a big issue, anyway (IMHO).