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The purpose of this retrospective study is to evaluate the association of total therapy time during inpatient rehabilitation and gain in functional independence for patients admitted to an inpatient rehabilitation facility (IRF). The study utilized a retrospective design that included all IRF patients from three IRFs in California from January 1, 2012 to December 31, 2013. Patient data collected as part of usual, routine medical, and rehabilitation care were used and includes demographics, medical variables, and functional outcomes data. There were 3212 patients discharged from the three IRFs, with 2,777 patients having received speech language pathology (SLP) therapy along with occupational therapy and physical therapy. Speech language pathology services were not provided for 435 patients in the database. Our results support that among all types of patients, increased therapy hours were associated with increased functional gains. For total functional independence measure (FIM) gain, an additional hour of PT therapy per day was associated with an increase of 7.55 FIM gain points (p < 0.001) and an additional hour of OT therapy per day was associated with an increase of 1.16 FIM gain points (p = 0.045), when adjusted for other variables in the model. SLP hours per day did not remain in the FIM gain model. The findings of this study add to the understanding of therapy time and functional gain in an inpatient rehabilitation program. There is a positive relationship between total therapy time and functional gain. In the future determining the intensity and the related therapy activities provided will be needed to impact functional change. This has implications for shaping rehabilitation practice in the future. Increased number of therapy hours were associated with functional gains in an inpatient rehabilitation program for all types of patients. An additional hour of physical therapy per day was associated with an increase of 7.55 functional independence measure (FIM) point gain. An additional hour of occupational therapy per day was associated with an increase of 1.16 FIM point gain. Determining the intensity and related activities are needed to impact functional change which has implications for shaping rehabilitation practice. [ABSTRACT FROM AUTHOR]