It depends on how many test strips you have, too. David Mendosa wrote an article about how the best time to test after a meal is 73 minutes. So if you're short of strips, you could do one test after a meal instead of two and time it for then.
If you've enough test strips to survive, or can get them, then it's a good idea to do the full testing for the first while - and the food diary.
After that, you'll probably be able to ease up some, once you get an idea which foods cause your blood sugar to spike the worst, and which don't. E.g., I can have a salad and my blood sugar usually won't go up at all, but if I go near wheat, I'm in the double digits. Sometimes I can manage a little bit of grain (maybe a tablespoon of rice), but not everyday. Other people can.
As a general rule, starches, sugars, potatoes, breads, cereals, and grains generally cause most of us to spike - so cutting back on those will help, all things being equal. Some people also spike from artificial sweetners because the sweet taste causes an insulin release in the body. Not everybody, but some.
So beg, borrow, or steal (begging sometimes works - I'm a T2 and I get 100 strips a month - at this stage of the game I don't test everyday, but do test fully on some days) enough test strips from your GP to keep a good standard of testing til you know how you react, and what you can and can't get away with. After that you can ease up on the testing some. But you need to know what sets off your system in particular if you're going to come up with a sensible diet you can live with.
A good site with lots of beginner info in plain English (it's in American, though):
http://www.phlaunt.com/diabetes/
Divide the blood sugar numbers there by 18 in the places it's not already done to get what you see on your meter, cos the Americans measure differently.