It depends on the job, on the baby, on now much support you have AND YOU.
I had 3 days off when I had my DS (planned C Section). I was self employed - bit hard to explain, but I was in the middle of a big project I had initiated and had a crucial role in - but I had no control over the delivery schedule.
I was working from home (otherwise I don't think it would have been possible, unless I had fed formula from day 1 and so could leave him with DP/grandparent/nanny etc). I was working full time, but in practice this meant working whenever I could, how I could - around the very sporadic naps of a velcro constantly BF-ing baby. Often had to sit down to work at 3 in the morning, crying with tiredness.
It was hell and if I knew now how bad it was going to be, I would never have done it. I was beyond even the usual exhaustion of a normal new mother, I had constant health problems with mastitis and other infections (14 courses of antibiotics in 12 months) - I was utterly miserable and just felt like I was doing everything badly and enjoying none of it. The only positive (apart from a healthy lovely baby) was that I had an easy birth and recovered quickly.
But that's an extreme example! I think I would have loved a 'one afternoon a week' job, quite early on, wherever they are to be found....if it got me out of the house. Working at home was actually very oppressive - I could go days without leaving the house and I hated that.
I have no 'political' views in how much time to take off work (I am a feminist, career woman and main breadwinner in our family btw). But i think it is really really important for new mums to be to as open as they can be to the changes in their life that a new baby brings, and to accept that their predetermined ideas about themselves and their baby may simply turn out to be irrelevant. You really do have no idea how you will feel or how your baby will behave, and I just think you need to keep your options as open as possible. I am being positive here, btw! I think women need to trust themselves to cope with whatever is thrown at them, and not fall into the trap of planning how new motherhood will be, and then suffering all manner of disappointment/frustration/feeling a failure etc when it isn't how they planned it.
Be careful in particular of 'when can I leave my baby with a family member.' If you are breastfeeding, you might have a baby glued to you for weeks. Don't assume you will be able to feed formula whenever you want, no matter how relaxed you personally are about using it - if you get a baby that doesn't want to use a bottle, that's not an easy problem to fix. You might get a baby that has epic naps when it is very small (I have heard they exist....) and it will be fine to go out for a couple of hours. But you just don't know.
And if you tell relations, particularly excited grandparents, that they might be getting a small baby to look after from very early on... and then you find you can't or don't want to leave your baby.... you have all that disappointment and pressure to deal with too.
Looooooong post, sorry. But just let yourself see how YOU feel, what you and your baby need, and nevermind what anyone else is doing.