SIC time is absolutely loggable for ATP. It is 135 operation so SIC is actually required, but usually we use the autopilot in lieu of SIC so we can operate with or without a copilot. There is always a debate about whether the time is loggable, but I have about 600 hours SIC time from cape air, and got my ATP with no problems. Also just got hired from a 121 regional and they didn't mind that I had 402 SIC time.

You can get 100 hours a month once you hit the line , especially if you pick up some extra days. However training will take at least 2 months especially since we are getting close to summer and it backs up in the summer.