I am mostly (completely ?) in agreement with dannyv; this has some potential to develop.
However, with any new (to you) recipe, only by tasting; will you ever find out. TFA's Sweet Cream can take some time to fully develop (though more so at higher {+3%} percentages) and when the flavor is to take a more prominent "front-seat" role. But you are never going to know what tastes best to you (or when) unless you taste along the way.
I suggest tasting immediately after mixing, then again 24 hours later, and then every couple of days for the first week, followed by once or twice a week after that. AND ALWAYS TAKE NOTES of your perceptions of what you taste during each sampling. Only then will you know how much time that recipe needs for you.
You could chug through the entire batch in the first week and never realize its full potential, or you could park it in a closet for the next month and still have something perfectly vapable while not realizing you missed out on its best time; but you will never know unless you taste as you go.
Unless they are using frozen dinners; a good chef always tastes, and adjusts, and tastes, and waits, and tastes again, and knows when to stop waiting BECAUSE they invest the time and effort. DIY e-liquid is no different. And, just like cooking, your palate (what tastes best to you) is likely going to be unlike most everybody else. Don't be afraid to taste... there is nothing harmful in there if you do. Just don't make huge batches until you know what works best for you.
BTW: that sounds like a very workable recipe. I would personally guesstimate that recipe to mature closer to a one week window because of the lemon (lemon fades fast due to its nature of having large amounts of aromatics which evaporate relatively quickly; which will leave you with a very berry forward juice) or you could add the lemon after the cream fully develops; but that's just me. Thanks for sharing!
