In the time period of 1 125 days since December 11, 2021, customercare.hmhco.com had its availability checked 4 times total. With the last successful check on March 29, 2022, customercare.hmhco.com was operational 4 times, returning a 200 status code. As of January 9, 2025, all evaluations indicated that customercare.hmhco.com had no periods of inoperability. The results of the replies received as of January 9, 2025, confirmed that no responses had an error status. For customercare.hmhco.com, the March 29, 2022, response time was 0.681 seconds, contrasted by a 0.733 seconds average.