It happens, but I don’t know how routine it is.
One method is “double billing” where the attorney does one thing that simultaneously benefits multiple clients but bills each client full time for that thing, as DSYoungEsq mentioned. This usually involves travel. If I fly from one city to another to work on three cases in the other city, I can’t bill each client for the full cost or time of the flight. I have to split the cost & time 3 ways.
Another method is “value billing” where an attorney will bill a client for what the work is “worth” as opposed to the amount of time actually spent working. For example, let’s say I wrote a legal brief and it took me 8 hours. I bill 8 hours. If a similar case comes up in the future, I may be able to simply tweak the brief I wrote in the first case and use it in the new case. Let’s say I spent 1 hour tweaking the old brief to fit into the new case. I can only bill 1 hour for that, but some attorneys will bill the full 8 hours for the second brief as if they had created it from scratch.
Another method is simple “padding” where the attorney tacks small amounts of extra amount of time on the end of each item. Instead of billing 0.1 hours for that short letter, you get a bill for 0.2 hours. Small enough not to notice or make a fuss on a single entry, but it adds up.
Another trick is billing for work the attorney doesn’t do. Maybe the attorney has an experienced legal assistant or paralegal who can perform simpler legal tasks and write simple letters and such. The attorney may simply take 0.1 hours to review the work performed by the assistant, but will bill for the full amount of time it would have taken as if the attorney did the work himself.
I’ve worked with attorneys who did all this stuff. The gossip mill in one firm said that one attorney managed to bill over 24 hours in one day. The time was spread out over multiple cases, so no individual client would know the difference.
I worked for another firm where one of the partners left the firm in part because of unscrupulous billing practices. He accused the senior partner of intentionally “torpedo-ing” settlement discussions by being as unreasonable ass when negotiating. Of course, the cases didn’t settle, but the partner would go back to the client and explain how unreasonable everyone else was and how reasonable he was. Of course, if a case settles early, the firm loses a paying client. If the case doesn’t settle, that means the firm can keep billing the client.
Anyway, I am a solo practitioner now, and my own boss… so I don’t have to deal with that BS anymore.
As mentioned, the best way to avoid these problems is to review the bill carefully, question items on the bill that seem weird or inflated. However, unless you are knowledgeable in how long it takes to actually do stuff, this may be difficult. The rule in these parts is that the attorney doesn’t bill for “administrative” time such as making photocopies or preparing or discussing your bill. The attorney can charge for the cost of photocopies in terms of paper and toner and wear-and-tear on the machine, but not the time it takes to make a copy or send a fax, etc. So if the attorney drafts a simple one-page letter and bills you more than .02 hours for it, that’s a tip-off that your bill is being padded.
Also, on preview, billing reasonable amounts for reasearch is normal. Attorneys can’t possibly have every statute and case in their heads at all times. The question I usually ask on research is, “Is this a routine question that a more experienced attorney would know instantly?” If the answer is “yes” then I spend the time, but I don’t bill for it.
Also on preview, young attorneys in firms are under tremendous pressure to bill their whole lives away at work. So, they are more likely to bill for every little thing, pad their hours, etc. The partner should cut the associate time down to a reasonable amount. However, the firm should not bill a client for the young attorney to learn things that more experienced attorneys already know. In other words, a firm should not bill a client for on-the-job training of its associates.