Corey Hart doesn't want to hear about timetables anymore. They just don't mean anything at this point.

After the Milwaukee Brewers' first baseman underwent surgery on his right knee in late January, he optimistically suggested he could return to action by the start of May. Hart didn't even come close to that personal timetable.

The Brewers were more cautious, with a prognosis that Hart would return by the start of June. That one wasn't close, either.

With Hart's rehab process going far more slowly than anticipated, general manager Doug Melvin recently said he'd be glad to get his big slugger back after the all-star break. But even that timetable seems overzealous at this point, with Hart not close to being ready to play games, even on minor-league rehab.

To say the least, Hart is an extremely frustrated individual.

"Our timetable was off, so now we're taking it day by day," a dejected Hart said Sunday. "They definitely overshot and it gave me optimism and hope. At the same time, it wasn't realistic. So, I'm just trying to grind it out and see what happens.

"It's definitely gotten better, but their timetable just never happened. They would say one thing and it never happened. I can do everything; I just can't do everything as good as I need to. I don't have the strength in it I need."

Hart's possible return after the all-star break became unlikely when he suffered setbacks in recent workouts. At this point, it's not completely out of the question that he will miss the entire season, though nobody is ready to say that yet.

"I don't think that will happen but there's always that chance," said manager Ron Roenicke. "There's no way to know. The setbacks are really difficult when you're at this length of time.

"When we said it would be four months (from the time of surgery), we were hoping everything went perfect. If he's looking at five months or six months, that starts to get to you. It hasn't gone well lately."

To say the Brewers have missed Hart's production at first base is the understatement of a disappointing season. Over his previous three seasons, he averaged 29 home runs and 83 RBI over a norm of 141 games.

When utility infielder Yuniesky Betancourt was moved to first base and put together a surprising April (.280, six homers, 21 runs batted in), it appeared the Brewers might be able to partially cover Hart's absence. But Betancourt since has fallen off the face of the earth (.164 batting average, .196 on-base percentage) and newcomer Juan Francisco hasn't made much of an impact, either (.156, one HR, six RBI in 16 games).

How sad has the first-base production been for the Brewers? They rank last among the 30 major-league clubs with a .506 OPS (on-base plus slugging) and .222 on-base percentage, 29th with a .284 slugging percentage and 79 total bases, and 26th with five home runs.