There are always variations in the Philippines, but as you have said Phil they will always comply with the law.
The 10 days wait for marriage licence issue is mandatory. If the 10 days ends on a non working day or if the local authorities want 11, 12 or whatever number of days that's fine. Just as long as the 10 days minimum is complied with.
Always be careful when counting days and expect the unexpected.
Then smile.