Synonyms for the phrase "technically justified period" can vary depending on the context. However, some possible synonyms include "legally acceptable timeframe," "valid interval," or "reasonable duration." These phrases all suggest that there is a specific period of time that is justified by a certain set of rules or requirements. Additionally, other potential synonyms may include "justifiable timeframe," "defensible duration," or "permissible length." Each of these phrases implies that there is a justification for the period of time in question, whether it be based on legal or ethical considerations, practical considerations, or simply common sense. Ultimately, the most appropriate synonym will depend on the specific context in which the phrase is being used.