What does "I don't have time to spare" means?

[Naben123]

I just got a email from an A&R at Alantic Records 4 days ago letting me know that he wants to give me a development deal

He typed "I have to make this email very short Because I don't have time to spare. So please reply if your interested in his deal."

What does "I don't have time to spare" means?

[TimePhantom]

It means he is busy and is probably expecting a short and quick reply from you.

[TheCheshireCat]

It means that he is busy & doesn't have much time to spare...