Read this is the phrase

"When a person is in on H1B
visa, he/she should be working for the US employer and getting paid
according to the terms on the Labor Condition Application. There is no
such thing as a grace period or bench time without pay. The employer
has to pay the H1B employee whether or not the person has a "project."

Anybody,
if you have the link or thread could you post where you found there is  "10 days" grace period is available. As
per terms, assumed that there is no grace period on H1, the last day of
pay chex is the date of validity.

Thanks