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[Epiphone]

Hang on a bit, we are 10 a penny code hackers

Some of us are BoS support monkeys if you don't mind.

[Zorba]

Just my 2p worth... unless I really wanted the job I think I'd refuse, just to discourage this kind of practice. I'd suggest that before long we'd be doing free weeks, discounted extensions etc.

Doomed etc.

[tim123]

I don't know what area you work in, but I'd be very wary of doing this - if you are technical then it could be a ploy to present you with "a challenge" on the free day -i.e. something they cannot get fixed but get you to fix it for free.
Naturally after you have done this, the job offer never materialises
Seen this kind of stunt pulled in interviews - but much less risk if your work is more business orientated

As you say this depends upon what you do.

But in my line of work I don't expect to do something that can be delivered as a solution in one day. But I do think that a client can get a good feel for what I am capable of in one day, ... provided that he is looking properly.

tim