That depends. The rate of the reaction (water splitting) is based on the amps of the battery and the time left to react. Typically the hydrogen would be at about...
The only thing under your control is the story; you can't twist people's arms until they scream that it's good. So the only way to make people love it is...
Do a 'Train the Trainer' course for tips, but beware of any that don't accentuate the need for the development of personal style! You should get the following topics: outline...
You could check some local used bookstores and ask the manager about your project. You could also go to a thrift shop like Goodwill or something similar to it, sometimes...
Agents, trade publications, and casting calls are popular methods. However, be discerning when looking on your own, since there are scammers offering invalid vouchers as enticements.