Hi,
It can be possible to have such feature in the plugin but it as to be develop and integrated.
For the moment there is just an option to add fixed "waiting days" but there is no option to set an hour when the plugin have to add an extra "waiting day".
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.