I have Tournye Manager and have the same situation that Blue Fool ( with a bigger sample size) .There is no pattern at all , although I play regulars stts and they only fill up about 7 hours at day ( prime time european) .

Having said that , I think the only thing u have to do is adapt to regulars at the table or ocassional player .
Better time ( more traffic) , better players ( more regs) , more understanding of bubble and early play .
Away from this time table , more loose players , less multitablers , more players calling with KJo in bubble .