A rough example of the idea that you can blow-away child state by passing a new key

probably_a_bad_idea.jsx

class CanResetChildren extends React.Component {
  constructor(props) {
    super(props)
    this.state = this.initialState
    window.setTimeout(this.reset.bind(this), 60000)
  }
  
  render() {
    return (
      <div>
        You have 60 seconds to complete this form
        <SomeChildWithState 
          key={this.state.gotInitialStateAt}
          {...someRealProps} 
        />
      </div>
     )
  }
  
  reset() {
    this.setState(this.initialState)
  }
  
  get initialState() {
    return {
      gotInitialStateAt: new Date().toString()
    }
  }
}