Transferring airtime from one active fone to another active fone seems to be a very common thing for trac CS. Most trac CSR's seem to be able to handle this with ease.
The only time the "possible 2 week wait period" may come into play is when transferring from a fone on which you cannot verify the airtime (lost, won't turn on.....). That is why keeping record of your parameter 0 and parameter 30 values can come in very very handy. Occasionally write down the 2 values and the corresponding minutes. If you have those values you don't have to tell CS that you lost the fone. Simply give them the minutes and the values when they ask for them - just as if you had the fone in front of you.
usac.org is a great place to blow a whistle!