If the allegation is of recent lewd and lascivious acts, or of relatively recent anal or vaginal penetration, then the police will likely order a medical examination of the child and a forensic analysis. This may include analysis of the child's body, clothes and the location of the alleged incident.
Different types of decorative concrete involve different processes so timing will vary. However you should normally allow between 8 to 20 days for us to undertake and complete your job.
The 28 days is not really how long it takes concrete to cure. Concrete continues to gain strength for years as long as some type of moisture (even humidity) is available. The 28 days is the standard time at which they test samples in the a to determine if the mix meets the specifications.