How many data pars can be in an Time History *.TIH file in AutoPIPE?
Please see the following help section:
Help > Contents>
Time History Profile>
Near the bottom of the page select the hyperlink for "Creating an ASCII Time History (TIH) File "
after selecting this hyperlink for "Creating ASCII file", near the bottom page is information about how many data pairs can be added to a TIH file for that version of the program.
Dynamic "Time History" Analysis