No. Since there are no restrictions on the frequency of transactions or on the weightings of countries after their initial allocations have been set, keeping the countries without making any transactions for a long period of time will not cause any problems.
In principle, asset management is not a means to obtain gains by making a great deal of short-term trades. Your investment performance will instead be negatively affected by daily trading, as fees are incurred for each trade. Also, it is very difficult for investors to succeed with market timing, which aims to take advantage of short-term price movements through trading. This is because stock prices can fluctuate in an extremely short frame of time, and in many cases an upswing in the market happens suddenly and comes to an end with equal unpredictability. In such circumstances, investors who were not invested for that particular period of time will miss out on the majority of the potential gains. That said, there are certain times when the concept of market timing can be attractive, and it is not necessarily something we should completely dismiss.
That is why Nikko Asset Management proposes the money management framework known as the Three Pockets. The concept is to divide your money into Three Pockets in accordance with the aims of your investment.

The Three Pockets are:
A Savings Pocket in which you put money as an emergency reserve; an Asset-Building Pocket in which you put the money that you will need to fund future plans; and a Trading Pocket in which you put money that you aim to achieve high investment returns with.
The Savings Pocket is something everyone should have, as it is for money that may be required in emergency situations such as illnesses or accidents. Money in this pocket should be invested in vehicles such as bank deposits, savings accounts, and MMFs, which have a higher degree of principal protection. The target amount for this pocket is equivalent to your monthly living expenses for three to twelve months.
The Asset Building Pocket is for money you require for future plans, such for buying property or to take care of living expenses in your retirement. Therefore, you should use time and diversified investing to your advantage and aim for a better-than-average investment performance that exceeds that of bank deposits and savings accounts.
Lastly, the Trading Pocket is for “extra” money which is free to be used for investing or speculating with the aim of achieving higher returns. This is a pocket which allows you to indulge in the stimulation of speculative investing, and not everyone needs to have it. However, it is indeed a fun pocket to have. But what is important is that you only put “excess” funds in the Trading Pocket after you have fully funded your Savings Pocket and your Asset-Building Pocket.
You can then enjoy taking a chance at market timing through the Trading Pocket.