Change of status from h1b to b2 after 6 years while perm is pending

[Ravikp]

I have filed for change of status from H 1 to B2 on last day of my I-94 expiration. If this request gets declined, will I accumulate illegal stay from my I-94 expiration date or COS denial date?

[jairichi]

From the day your COS is denied.