Perhaps most striking about it all is how fast it all occurred: between the time that Iran notified the IAEA in writing of its plans (Feb. 8, Monday) and began to move LEU to higher enrich (Feb 9, Tuesday) was 24 hours. Iran did wait for IAEA inspectors to arrive at the Natanz fuel enrichment plant Tuesday before moving 10 KG of low enriched uranium from the Natanz fuel enrichment plant to the pilot enrichment facility.
But note that when Agency inspectors arrived at the pilot facility the next morning (yesterday, February 10th), Iran informed them that they had begun work there the previous evening on a process called passivation (Lewis explains what that is). The IAEA inspectors "were also that told that it was expected that the facility would begin to produce up to 20% enriched Uf6 within a few days.