der Zeitraum
period / time span
A specific, defined duration or span of time between two points in time.
Der Rabatt gilt nur für den Zeitraum vom 1. bis zum 15. Mai.
The discount is only valid for the period from May 1 to May 15.

period / time span
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period / time span
A specific, defined duration or span of time between two points in time.
Der Rabatt gilt nur für den Zeitraum vom 1. bis zum 15. Mai.
The discount is only valid for the period from May 1 to May 15.

'Zeitraum' is made up of 'Zeit' (time) and 'Raum' (space). You can picture it as a 'space in time'—that is, a clearly defined starting and ending point.
Wir müssen für das Projekt einen genauen Zeitraum festlegen.
We need to set a precise time frame for the project.
To define a span of time, the structure 'im Zeitraum von ... bis ...' (in the period from ... to ...) is often used. To indicate a duration, you use 'für einen Zeitraum von ...' (for a period of ...).
Das Museum ist im Zeitraum vom 10. bis 20. August geschlossen.
The museum is closed during the period from August 10 to 20.
The word 'Zeitraum' (period / time span) is often used in formal, official, or planning contexts, for example in contracts, project plans, or historical reports.
Bitte geben Sie den gewünschten Lieferzeitraum an.
Please specify the desired delivery period.
time
'die Zeit' and 'der Zeitraum' can both refer to a period. 'die Zeit' is the more general word and is also used in many fixed expressions. 'der Zeitraum' sounds more precise and means a defined span between a beginning and an end. Learners may confuse the words because both talk about length or sections of time. When the beginning and end are important, 'Zeitraum' fits better. When you are only talking about time in general, 'Zeit' is more natural.

Für die Anmeldung gibt es einen Zeitraum von zwei Wochen.
There is a two-week period for registration.
Luis nutzt die Zeit in der Pause für einen kurzen Anruf.
Luis uses the time during the break for a quick phone call.