Thought we'd already got 23? Seriously though it probably depends on when and who we get them against, eg wins against Reading, Derby and Peterborough would be more likely to do it for us than, say, a loss to Reading but a win against Fulham. We have a great chance coming up to put pressure on the others by taking advantage from the next game at Derby and then 3 consecutive home games.
I just hope the players aren't looking at the table and the fixture list. Our run-in is quite similar to last season. When we lost to Norwich, Watford and Swansea over the new year period I looked at the fixtures and thought barring Bournemouth away we had a chance of the Play-Offs if our results mirrored the first half of the season. This season I look at the run-in and every game is winnable barring Fulham at home. There will be defeats but I'm as confident as I can be based on fixtures alone. I know football isn't played on paper.
Another 21/22 would definitely be enough. Wildly optimistic too. I think around 19 would be enough to be honest but beating Reading is a must.