I wouldn't recommend macerating the strawberries for longer than 12-24 hours. The process of macerating will happen quickly for thin skinned fruit like strawberries. While you can technically keep the berries in the fridge for a day or two, they will continue to soften as they do. I recommend macerating them right before serving for the best consistency. If you're feeling nerdy, read this explanation of why maceration is cool (and other ways to do it). Whipped cream will only keep for a few hours, but you can get away with using a mascarpone stabilized whipping cream if you're working ahead. If you're a big fan of freshly whipped cream but don't wanna fuss about it, you can also invest in an iSi whipped cream dispenser. (Just read this if you have kids before you buy one.) Biscuits are best warm from the oven, but you can make them ahead and freeze, then defrost, slice and reheat in the oven at 200F.