How many questions a day, addressed on musing, would you consider "enough" for your and the rest of users until they become spam?

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It's a good question. 

For me, the incentive of rewards is something that pushes Musing to the forefront of the web Q&A sites. But this incentive also increases the likelihood that people will just ask random questions, playing the volume game, in the hope of landing a few upvotes. This is likely to lower the quality of questions and make it more difficult to find the interesting ones.

A restriction on the number of questions or answers per account per day could help reduce this abuse. However it is probably quite easy to get around such a restriction through using multiple accounts.

In addition, it is possible that someone could ask 10 great questions in a single day, and there's no reason to lose that input.

So, rather than restricting the number of questions, an alternative is to make sure that three other elements of the site work smoothly:

Moderation (and communication of moderation)

Only rewarding quality questions and answers should help to de-incentivise spam questions and answers. In addition, providing good communication of what good quality questions and answers look like should aid newcomers to the site. A nice little set of videos on the landing page would be a good way of doing this. 

Filtering

Filtering / ordering of both questions and answers so that higher quality questions and answers are more visible to casual users would reduce the impact of spam questions on site visitors. 

Removing duplicates

Removing / merging duplicate questions could help reduce spam questions, since many of the most obvious questions are repeats of earlier questions.

If spam questions are less visible than more original questions, and spam questions receive no rewards then (a) their impact on the site is much reduced and (b) people will strive to ask better questions.