It defaults to two toilets simultaneously thus 10 working days;
I heard some say you can request for one toilet at a time so a total of around 20 days to complete (for old folks?).
My mom in on wheelchair, even if have toilets below also very troublesome if in the middle of the night need to wheel down.
Kind of thankful the purchase was done at right time and I did a full renovation works including toilets.
When they did water testing, I also requested morning test 1 toilet, noon test one, I cannot have both tested at the same time due to my mom's immobility.
Good thing is when I leave home or come home, I can use the toilet downstairs... hehe, my sister and some others take water from the toilets wash car. One uncle practically went to every portable toilet at HIP site to shower and go home.
My side now resuming some HIP units. Think these are teachers or people who cannot take leave during the actual HIP and has to wait for school holidays before doing HIP. The HIP people are flexible within means for special cases.
Down side is... the workers use the lifts heavily, do allocate like 10mins more to your travelling time. You will see the lift stop at 2, 3, 4, 5, .... 14. Then door open, you see workers inside with cement, tiles tools, then you got wheelchair, no need go in, wait for next.