replacement of a device with manufacturing defect

how long should it take for apple to replace my iphone in warranty with manufacturing defects?? I bought an iphone 12 in the month of March 2021 in the Philippines from a carrier store. a week after purchase it was rebooting itself in a loop. i went to the store i got it from and they told me to go to apple service center instead. it worked fine for next week or so but the reboot problem started again. so i tried troubleshooting struts over phone from apple's call center. they asked me take backups and reinstall software and try to work the phone and see if problem still persists i kept trying for a week or so but the problem was still there so i booked an online appointment to go to the apple service center. i got an appointment for 26th April. i submitted my phone to them on same day. they told me they will update me in a week about the device either repair it replacement. so in may 2nd 2021 they sent an email saying the replacement has been approved. and will take upto 3 weeks for them to replace and dye to COVID-19 it might take anywhere from 5 to 7 weeks. today i am 10 weeks into this charade and the service center still says they cannot guarantee the arrival of my device. considering covid a parcel of 26kg was delivered to a friend from Oman containing good and electronics in a matter of 20 days. its been 2 months and apples cannot get a package for replacement from their disagree facility to the service center near me?