trial sessions for nannies - does this sound reasonable?

[motherpeculiar]

met 4 potentials today - all good in different ways. have decided we want to take things further (sounds dodgey but ykwim) with two
instead of a 2nd interview I thought of having a (paid) trial half day, where they would spend 4 or 5 hours with me and the kids, maybe knock up a spot of lunch, come to the park with us etc. I want to see how they are with the kids (obviously) but also how good they are at organising themselves and just chat a bit more in order to glean things you can't in an interview situation
Both have fairly busy other lives, and other long term career goals (which is fine as I think we'll be moving on from the nanny solution within 12 months once DD1 hits year 1 at school) so I also want to get a sense of how committed they would be to the job, which I might get a better feel for from a longer, more informal session
what do you all think? is this an accepted procedure or will they think it's all too much?

I think it's fair and good that you are paying.
A sight refinement might be allowance for trave..

In my game, one is never paid for interview, but travel expenses are paid for non trivial journeys.

Uwila has a point about it being a filter for their flexibility. As someone who selects staff for a living, I would worry a little about some who seemed desparate, and there is a boundary here.

Also this is a courtship on both sides.
You can probably get away with not paying, and a hard nosed position is that you don't care about upsetting the people you don't hire.

But...
My firm is very keen on what we call "soft landings". It's not enough just to get a job, or to get the right person.
As a pimp I want both sides to feel they are getting a good deal. She's going to be caring for your children. It's not enough to make them do what you tell them.
They have to care. For the cost of what amounts to 2 days pay , you've helped keep whoever you hire sweet.
You're being smart with a small % of the transaction cost.