not going to hurt to taste your mix within minutes, an off strawberry will be what you taste though, creams usually take time to come through.
personally i taste my new mix after a couple hours and almost every day for the first 5 days, sometimes 10 afterwards. i learned a long time ago that my tastebuds are not normal and mostly prefer juices/mixes on the fresh side and not after they age/steep past their 2-3wks mark..exception multi-creams/custards/tobaccos..
You may prefer yours steeped longer or not, so kinda best to taste test your new mixes regularly until you learn when you personally like them best IMO.