#include<iostream>
using namespace std;
int n,k,t,x[100005],vis[100005],finish,start;
int ans;
int main(){
	cin>>n;
	while(n--){
		cin>>t>>k;
		for(int i=1;i<=k;i++){
        	cin>>x[i];
        	finish=max(finish,x[i]);
        	vis[x[i]]=t;
		}
        start=max(finish-86400,0);
		for(int i=start;i<=finish;i++){
			if(vis[i]>0) ans++;
		}
		cout<<ans<<'\n';
		ans=0;
	}
}