be not up to much

基本解释

Of course, they must be careful not to let it take up too much of their time because study is still their primary responsibility.
当然，他们也必须小心，不要让打工占据太多时间，因为学业仍然是青少年首要的责任。
Of course, they must be careful not to let it take up too much of their time because study is still their primary responsibility.
当然，他们必须小心，不要让它占用太多的时间，因为学习仍然是他们的首要责任。
Of course it’s great to earn and save up money, but be careful not to work too much.
赚钱存钱固然好，但是注意别工作过度了。

But ask fliers directly about acceptable alternatives to those measures, and it seems they may be willing to give up much less: not even the five minutes necessary to buy an overpriced burrito at their gate.
FORBES: Travelers Fear TSA's Radiation And Groping--Almost As Much As Losing Five Minutes
Judging by the way it was announced, and the fact that the committee will not be set up by law and will be purely consultative, the government is not keen to give it much importance.
ECONOMIST: The constitution
To be fair, it is not easy to come up with a consistent formula for how much devolution is enough.
ECONOMIST: Republicans are for states’ rights—when it suits them