The cab has different resources that could run out:
- A new line card needs to be added, for more ports
- New tie pairs need to be added, for more connections to the PCP
- A new cabinet is needed, because the previous one is full
The time required is least for the first issue, and most for the last issue. It could be anywhere between a couple of weeks and 6 months.
Of course, anyone could give up their connection in the meantime, making it available instantly.