Trevor Ward top scored with 168 as Essex's openers looked to make inroads into the mammoth score.
Leics 600-7dec, Essex 13-0 (6.0 overs)
Division Two
Hampshire
After bowling the home side out for 384, Hampshire then lost openers Derek Kenway and James Adams without scoring. The visitors were 29 for three at lunch.
Yorkshire 384, Hampshire 29-3 (7 ovs)
Other scores
Division 1
Old Trafford: Lancs 575-6 (Law 236 not out, 129 ovs) v Warwicks