WolframAlpha imposes a limit on the amount of computational time it allows for each computation. If you have WolframAlpha Pro, you can do computations with a higher limit on computational time but I often find that the computation times out even so.
Is there any way to get unlimited computational time, or failing that, at least more than what Pro gives you?
I'm fine if it entails using client-side computational resources, i.e. it uses my computer to do some of the computational work. The only thing is that I'd prefer not to buy Mathematica.