You owe the company 17 days a month. So you get 13 or 14 days off. In a one month bid the 17 days normally are together. So you could work the 1st to the 17th and have the rest of the month off. Or it could be the 3rd to the 19th. So how much time off you get really depends on last month's bid. If you're HSV based most of the trips get in too late the last day to get out so you're going home on day 18. If you're JFK and actually have to go to JFK many trips start at 2z so you'll go up there on day 0.

If you get a "60 day line" which is really a 2 month bid you'll work up to 34 days. Normally those days are broken into 3 parts. Per the contract there has to be 5 days off between "patterns" of work days. How many days you spend at home depends on where you start and stop flying. Some bases, CVG, IAH, MIA and HSV, are like real airline bases with most their flights starting and ending in base. JFK and PAE have more lines that start or end with a DH which means the company will DH you from your gateway on day one.