1. It surely depends on your skills, some can do it in less that a week,
other a whole month, also the complexity that you put into the game counts
here. Should it be exactly like the old pacman?? what about sounds are they
provided?

2. that depends on the costumer, are they selling the game to others? then
you migth get a fixed price every time they sell(if you know that they have
a lot of costumers), or ist a company that just want this game as a
promotion thing where you can download it for free??

So as you can see there are a lot of questions to consider before you can
name a price and the time you need to put into the project.

Cheers

Claus Petersen

ask the customer what his budget is.
they can give you a starting point - what is it worth to them.