I googled but couldn't find if anybody else had the same problem, but I am finding WebGL builds taking far longer than any of the other platforms - in the order of a couple of minutes or so. Just checking if this is normal at present...?
Yes this is "normal". WebGL builds currently have much longer build times than other platforms in Unity. I hope it gets optimized soon, because we all need to switch to WebGL since Web Player is deprecated on browsers already.
Yes the builds are sliwer due to a few factors (iil2cpp compilation, emscripten, different optimization settings). I've seen that fastest optimizations can even double the build times for our game.