def changeTimeFormat(runtime):
    """Improves the readability of process-runtime.

    Only useful, if runtime is greater than 60s.
    :float runtime: the runtime in seconds
    :string return: runtime divided in hours, minutes and seconds
    """
    result = ''
    runtime_int = int(runtime)
    runtime_orig = runtime_int
    if runtime_int > 3600:
        result += str(runtime_int / 3600) + 'h:'
        runtime_int = runtime_int % 3600
    result += str('{:02}'.format(runtime_int / 60)) + 'm:'
    runtime_int = runtime_int % 60
    runtime -= float(runtime_orig - runtime_int)
    return result + str('{:05.2f}'.format(runtime)) + 's'
