How soon should I start expecting calls?

My cover letter and resume were submitted to at least 850-1200 different oil rigs yesterday. (Couldnt count exactly how many). How Long do you think it will take for me to start receiving calls about open positions? Although its slightly but not completely relevent I have laborer engineering, and experience as a concrete finisher. Note that the oil industry is always active and there's always a demand if you have the proper contacts my brother in-law has been doing the work 15 yrs. and never had a lack of work. Also spring is one of the biggest hiring times for the oil industry. It usually takes within 30 days to find placement. 10 points to whoever has the most realistic answer.