Ann: Half Yearly Report and Accounts, page-306

Phase One full capacity is about 350kg per day of liquid helium. It would take 14 days at full production to have enough to fill at about 5000kg per iso container.

Even longer to produce a container load if not yet fully ramped up and going at 50% capacity for instance..

So could take 14-30 days to produce a container load which can be stored I guess before an iso container arrives.. Noting it is also slow to fill the iso container also if it needs to be cooled down something along those lines.

Phase 2 is meant to be much larger about 4200kg daily so just under a 5000kg iso container load daily..