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Coarticulation is an important phenomenon that affects the realization of phonetic segments. The effects of coarticulation are prominent in both spectral and temporal domains. Various durational effects of phonetic contexts on the adjacent phonetic segments have been previously reported based on individual distinctive features (e.g., voiced stops lengthen and unvoiced stops shorten the preceding vowels) or specific contexts (e.g., both /s/ and /p/ are shorter in a /sp/ cluster). This paper presents a comprehensive method for analyzing the phonetic context effects of all phonetic segments on the duration of their preceding or succeeding adjacent phonetic segments in fluent read speech, using the TIMIT American English corpus. Statistical methods are employed to analyze the variations in mean durations of all phonetic segments as functions of preceding or succeeding phonetic identities. 99% confidence intervals for the mean durations are also presented to reveal which pairs of phonetic contexts present statistically significant differences.