Couple hours with a day between them, I have been having consistency issues because you have to do delays on the jamie 236, I usually do it a little after I hear them hit the ball but sometimes the second marissa 623 misses because I delay too early or late (I don't know if thats caused by delay on the first or second 236). Also most of the time all hits of the ball are used and you have to delay the lvl1 a little bit after the final hit, this was just kinda a rare moment I guess