Dog with cancer- how long to live?

My dog was diagnosed with cancer and was given 2 months to a year to live (This was April 1st.) This morning I woke up to bloody vomit all through the kitchen and on all the dog bedding. She continues to vomit blood/clots periodically. She is restless, tired, and won't eat or drink. I know there is nothing I can do for her at this point but I was simply wondering how long I expect her to live in this kind of condition. I wouldn't think it would be very long but I'd mostly like to have a guideline on what I can possibly expect. As today is Sunday I won't be taking her to the vet but if she is still alive through the night I plan on having her put down. I don't want to see her suffer. 

Thanks for any help!

Update: Just in case any of you that posted an answer decide to check in, I decided to leave this bit of info: 

Minnie (miniature pinscher) 

died this afternoon at 3:15 pm 

It wasn't at all fun to watch but my mom and I sat by her side and helped her through it all telling her she'd be able to see her brother, Howie, soon. 

(Howie was hit by a car April 22, 2007). 

So... 

March 29, 1996 - April 5, 2009 

RIP Minnie CocoPuff 

We'll all miss you!!!

Update 2: Oh, and for the e-vet woman. 

I hate to tell yah, but I live in the middle of no where, and the nearest emergency vet is over 10 hours away. 

It had nothing to do with me wanting my dog to suffer, we simply didn't know how long she had (she saw the vet 4 damn days ago) and when we woke up this morning to everything going on we weren't quite sure what to do. 

She lived a good happy life and I'm proud to say I was there for her in the end loving her every step of the way!

Best Answer:  3 years ago my dog had leukemia, jaundice, and autoimmune deficiency and she lived for 2 months after her diagnosis (she also had a blood transfuaion) she was bad like your dog at first, she would faint and stuff but after 2 days of that she seemed to get a little better untill she got worse again a few days before we put her down, so mabe your dog will get alittle better soon. mabe he/she is having a bad day and will feel better tomorrow. i would give it a few more days unless he/she is really suffering.