There are tasks, which require huge amount of processor-power and time to calculate (couple of days, maybe weeks). Using virtual machines in cloud, like Amazon AWS or Google Cloud is the best solution in these situations. You don’t need to buy any new hardware, you can simply rent a required number of VM-s in cloud, use it for the given tasks and forget it.
Managing this kind of big job isn’t so simple, if you go straight in sequential order. This way you finish the first part, send the results to the next part, run that new task and so on. It’s not an optimal approach, because every group of tasks need to wait for the previous to finish.