How Do I Fix My Animation, That Keeps Getting Cut Short?

I have an animation thats 2 seconds long but its get cut short to 1 sec in roblox studio when i tell it to play in a script, anyone know how to fix this, i then decided to cram my whole animation into the 1 second but now it goes fast and when i slow it down it still gets cut short as if no animations above 1 second are allowed... Anyone able to help Thanks!