Would say that depends on the site/offer. In general there is a TON of money being thrown to players who are willing to deposit money to a site and play a certain number of raked hands, etc to unlock the bonus. Key here is to read the fine print at the site or send the cashier at the site a specific email asking any questions you have before you deposit. (I say cashier only because they usually have the most up to date info and at some sites the cust. service people will say whatever they think you want to hear so you will deposit).
If you are comfortable playing middle limits you should have no problem unlocking any bonus out there IMO. How long it will take is what the major differences tend to be.
Since they are trying to get you to put more money in the site, you should see an email about any reload offers, but sometimes they are only advertised on the site, or on forums.
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