Ready for Some Football. A Lot of It. Sundays are workdays for Brian Schwartz, the C.E.O. and co-founder of DraftStreet, a daily online fantasy sports site. "What I do on a Sunday impacts what a lot of other people do on a Sunday," said Brian Schwartz, the C.E.O. and co-founder of DraftStreet, a daily online fantasy sports site. Mr. Schwartz, who is 30 and lives on the Upper East Side of Manhattan with his wife, Jaime, their year-old daughter, Liv, and a pet puggle, Bascom, wasn't being arrogant; he was being accurate. Since it started in 2010, DraftStreet has acquired more than 350,000 users, he said. Most of them visit the site on Sundays during football season, which tend - at least in part - to be workdays for Mr. Schwartz. The company has its Fantasy Football Championship on Dec. 15. BABY DUTY I generally wake up when my 1-year-old wakes up, which is just before 8 a.m. My wife is a bit more of a morning person than I am, so normally she takes the first 15 or 20 minutes with Liv before I get out of bed. But by 8:15 or 8:20, I'm helping out, playing with her or feeding her some breakfast. EYE ON LAPTOP Sundays are our most popular day of the week at work - we get 40 percent of the entire week's revenue on Sundays - and since there's so much going on with the site, I usually have a laptop in viewing distance just to make sure that everything's going smoothly. At that point, I'm checking if the leagues are filling up, if we have to create more leagues. There are lots of customer-service issues: telling people how to draft a team, how to use the site, basic handholding. And we're always looking for new users, too. OFF TO WORK I don't really eat breakfast, but my wife has lots of cereal. Usually, I'm tending to my daughter until 10-ish, when I put her down for a nap. Then I'll head down to the office - it's just south of Union Square, on 12th Street between Broadway and University. That's where I might have something to eat. We have a spread out for the guys: bagels, cream cheese, all of that. PREGAME Everyone on the team, 15 guys, arrive between 10 and 11. We have an email guy emailing all of our users. Other guys are making sure our orders are running smoothly. Our marketing guys are trying to get people to tweet about us. And things really peak just before the games come on, between noon and 1. TOO BUSY TO PLAY We always have a bunch of TVs in the office to watch the games. A lot of the guys have their friends come over and watch, so we could easily have 30 or 40 people showing up. Ironically enough, we run a fantasy football site but no one has time on Sundays to look at their own fantasy teams. So we put in place a rule where you have to lock your teams in on Saturday night. OUT BY 4:30 I'm a Jets fan, so especially when the Jets are playing an early game, at 1, I'll stick around and watch. If it's an afternoon game, I may only stay for an hour or so. My goal is to leave the office when the first set of games are over at 4 or 4:30. WALK, COOK, MAYBE SHOP Now I'll go home and maybe take the dog and my daughter to the park - you know, spend a little time with the family. Normally Sunday is the only day all week I get to cook, so I'll go shopping for food, usually at Fairway on the Upper East Side. I make steaks. Sometimes, I make salmon. As I'm cooking, my wife and Liv are playing in the living room, or maybe Jaime takes Liv out to do some shopping. If that's what they're doing, I'm happy to be home. I don't really need to be around for shopping. STILL WATCHING We'll sit down to eat around 7 or so. The games are still going on, so I admit I'm usually keeping an eye on work. I know if anything urgent comes up, I'll get a text, but if there's a particularly good game that week, I'll have it on TV. My wife is not the world's No. 1 fan, but she can bear it. She understands I have a built-in excuse to watch. GAME OVER After we're done eating, we normally give Liv a bath at 8 and then her final bottle at 8:15 and then we put her to bed. Then Jaime and I will watch TV for the rest of the night. Recently on Sundays, we've been into "Parts Unknown" and "Boardwalk Empire." It's been a long day of sports at that point, so I'll shift to something else.