I live in a different country to you, and I daresay protocols are different all over the world, but PIC line dressings were always changed weekly where I worked, but that was in an acute care unit. I did not look after a PIC line while working in a hospice unit.

Hospice units often have different procedures to acute care. I remember that subcutaneous line dressings were changed every 48 hours in acute care, but only as necessary in hospice care, so I assume that PIC lines are treated in a similar fashion.

The reason for not changing as often in Hospice was to ensure the patient was not distressed un-necessarily. The site was checked 2-3 times daily, and changed if there were any problems with the site.