I agree that the raw time requirement is too heavy. But that is because the system forces you to be at the right place withing a friggin 5 minute window.

It would be much more comfortable on the player if the nodes were always there but could only be collected every half hour.
Then players wouldn't be forced into a ridiculously tight corset of timings.

Then again FF XIV doesn't log you out. So you can park your char at the nodes, tab out and do something else until FFXIVclock gives you the beep.