A Grande 16 oz of Starbucks Strawberry Acai Refresher carries 45 mg of caffeine, already under the 50 mg threshold where most people can fall asleep normally, so one serving needs no cutoff time. Multiple servings still stack: the median caffeine half-life is 5 hours.
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Starbucks Strawberry Acai Refresher Last-Call Times by Bedtime
Latest time to finish a Grande 16 oz of Starbucks Strawberry Acai Refresher (45 mg of caffeine) and still be under 50 mg of residual caffeine at bedtime, assuming the median 5-hour half-life. Your personal half-life may sit anywhere in the 2 to 12 hour range.
| Bedtime | Last call for Starbucks Strawberry Acai Refresher | Residual at bedtime |
|---|---|---|
| 9:00 PM (21:00) | Any time | 45 mg (already under 50 mg) |
| 10:00 PM (22:00) | Any time | 45 mg (already under 50 mg) |
| 11:00 PM (23:00) | Any time | 45 mg (already under 50 mg) |
| 12:00 AM (00:00, midnight) | Any time | 45 mg (already under 50 mg) |
Clearance Time by Serving Size
How long each serving of Starbucks Strawberry Acai Refresher needs before bed to drop under 50 mg:
| Serving | Caffeine | Time needed before bed |
|---|---|---|
| Grande 16 oz | 45 mg | No wait needed |
Source: caffeine figures from Caffeine Informer (values sourced from starbucks.com), accessed 2026-06-11. Values can vary by batch, location, and preparation; check the label or the source for the latest figures.
How the Math Works
With 45 mg per Grande 16 oz, a single serving of Starbucks Strawberry Acai Refresher never crosses the 50 mg threshold where caffeine measurably delays sleep for most people, so there is no last-call time to respect for one serving. That changes when servings stack: caffeine decays exponentially with a median 5-hour half-life, so two or three servings through the afternoon and evening can still leave more than 50 mg in your system at bedtime.
Individual half-lives also run from about 2 to 12 hours depending on CYP1A2 genetics, medications, smoking, and pregnancy. If you are caffeine-sensitive or drinking multiple servings, model your real intake in the caffeine half-life calculator.
