To give a point of comparison, Riverhead in Suffolk County is about 80 miles from Penn Station. Monthly tickets would add up to $6,000 a year. There's one train in the morning that you have to catch, leaving at 6:08 AM. It requires two transfers and gets to Penn Station at 8:23 AM. On the way back you again only have one train to catch, at 5:41 PM. It has one transfer and gets to Riverhead to 7:37 PM.

For not much more than 8 hours at the office (depending on how far away from Penn it is) you'd be away from your house for more than 14 hours every day.