timeUntilTimeout 

Namespace: SynicSugar.MatchMake
Class: MatchMakeManager

public float timeUntilTimeout { get; private set; }

Description 

Sec until stopping the process to wait for opponents.
This value is typically 0.
It is set to the same value as timeoutSec just before matchmaking starts. At that time, IsMatchmaking and isLooking also become true.
While isLooking is true, meaning from the start of matchmaking until a peer is found and P2P preparation begins, this value continues to count down.
Once isLooking becomes false and p2p preparation is complete, IsMatchmaking is set to false, this value is reset to 0, and the Matchmaking API's result is returned.

using UnityEngine;
using UnityEngine.UI;
using SynicSugar.MatchMake;

public class MatchmakingConfig : MonoBehaviour {
    public Text time;
    public void Update(){
        //Display time until timeout on GUI.
        time.text = ((int)MatchMakeManager.Instance.timeUntilTimeout).ToString();
    }
}