Prolonging the exothermic reaction between calcium oxide and water

Is it possible to generate 10-minutes of heat using very small amounts of CaO and water? This is an exothermic reaction.


I've done this experiment at home, but it is very short-lived. I'm trying to understand the ratio of reactants I need to generate heat that lasts long (like heat packs.)




There are funnels with an Archimedic spiral at the bottom -- in principle quite similar to a truck with a concrete mixer. So, provided you are able to grind CaO into a fine powder, slowly turning this screw will add CaO into a receiver flask below. Like this one: 


[![enter image description here](https://i.stack.imgur.com/acJ8T.png)](https://i.stack.imgur.com/acJ8T.png)


([reference](https://chemglass.com/funnels-powder-addition?AspxAutoDetectCookieSupport=1))


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