"collection period" is correct and usable in written English.
For example, you could use it in the sentence, "We are entering into a new collection period as of next month."
It is only possible to collect 30,000 points within one collection period.
Milk samples were collected twice daily during the collection period.
In bare soils and steppe landscapes, the two species were collected almost throughout the whole collection period (4 out of the 5 months collection period).
For this reason, I collected 10 English compositions from each participant during the data collection period.
It warned of an unquantified "increase in the collection period" for credit sales.
Nearly 1,000 testing mistakes involving 590 patients were reported during the collection period.
The yellow represents sample collection period.
A 5-day faecal collection period was used for horses and a 7-day collection period for sheep.
The longest data collection period spanned three consecutive years [8].
The actual data collection period varied from jurisdiction to jurisdiction.
The resulting data collection period spanned from 2010 to 2013.
