OK, so #94 and #95 means we are still not sure when it started.

The Guardian says “The tweets went out at around 2am Pacific time (5am EST, 10am BST).”
guardian.co.uk

The NY Times says 2am
nytimes.com

No matter what, it will take time to regain control of the twitter account if it was hacked. In the early morning hours of a long weekend? Even longer I would guess.