Indah is demand fed too, I feed her roughly every 3 hours (that seems to be as she demands it, but from 4pm onwards it could be every 2hours as she cluster feeds before bed & she usually has about 220ml of EBM at night from a bottle that Dh gives her (usually around 9:30pm!
As I start work at 8am & finish at 4:30, I am guessing I will feed when she wakes around 7am, then she will probably want a feed around 10ish, again around 1 & again around 4ish, so I will give 4 bottles of 250ml each to my sister or Mum whoevers day it is, so they should have enough!!!
I can then feed again when I walk in the door...

That's the hops/plan!!! :-k