I reckon there are two main strategies:
- To hell with work. If they really wanted you to work that hard, they'd pay you more.
- Minimise the effects by focussing on the training you can do in otherwise unproductive time.
The second approach is to reorganise your daily routine to fit shooting training in and to de-emphasise your daily activities which get in the way. Practice visualisation on the train* into work; do some SCATT last thing at night or first thing in the morning. Stop watching crap on TV or going to the pub. For example, I'm running the Queenstown Marathon in two weeks' time and to fit all the training in, I started running the 9 miles back from the centre of Auckland to the train station where I park the car in the mornings: Time spent commuting by train ~55 mins; time spent running 1hr 20mins; I get a 3:1 return on the additional 25 mins added to my day. This is the algebra of high performance that you will have to perform.
What I have tended to find is that I now need to spend less time training to maintain a given level of performance, which means that I can more easily accommodate surges in demand for my time from work. That said, further improvement has become harder to come by and constant repetition of technique has less value, and to make any such improvement I'm going to need to shock the system, which is probably going to require me to make a massive change in my level of commitment, training and a consequent easy patch at work.
* Or write blog posts, as in this case.