I don't constantly check this site so VMing me doesn't work if you want to get my attention. I will check again at 6 pm GMT -4 and if you agree on that time, then I will be ready and get on whatever server you're on ASAP.
If we don't fight today, we can do tomorrow at 5 pm GMT -4 or anytime after that. You can't just do "I'm ready to fight. So let's go." in a VM because I don't constantly check this site. I prefer a definite time and can do that easily since it's more manageable for me.
So 6 PM GMT -4 today is when I'm going to check again. If I don't hear back from you today, tell me a time that you want to fight tomorrow which can be from 5 pm GMT -4 on. No "I'm ready to fight now" VMs. Definite times only.