kung EMS, usually less than a month may notice ka na sa mailbox, you may have to pick it up at Pasay EMS (near domestic airport) regardless if you're from another city in Metro Manila. Dun yari ka sa customs duty, wala kang lusot.
kung normal USPS, I ordered a strat disassembled before, took almost two months before a notice arrived, and most likely you'll have to pick it up at your city's central post office, at magbabayad ka pa rin ng customs duty.
AFAIK, yung customs duty=3% total cost(declared value plus shipping cost)+12% VAT+750 yata (customs fee something).