How much Theta do you need to run a node?

Could you kindly elaborate on the requirements for Theta in terms of running a node? I'm curious to know how much Theta is typically necessary to fulfill the operational demands of maintaining a node. Could you provide an estimate or a range of the Theta quantity required? Additionally, are there any specific factors that influence the amount of Theta needed, such as the type of node or its functionality? I'm interested in understanding the economics behind this and how it affects the overall Theta network.