How do I store the results of a long symbolic calculation for later use?

Question

My calculations are something like this:

f[x_]:= (*runs fast*)
g[x_]:=(*runs fast*)
h[x_]=depends on f[x],g[x] (*runs slow ~5mins*)

Now I need

Answer 1

Try Save

Use like:

Save["h-defs.m", h]

And load with Get:

<< "h-defs.m"