Wicc
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With the current timers, where the starting bonus is only 2-3 times greater than the increase, you can spend it every turn. Just engage in a tough battle as your last action, and that's it. This is usually how it's done in blitz games.
However, with VT-style controls like 4000+500, you should consider the optimal use of the timer because half an hour is half of your reserve.
And yes, in the mid-to-late game, the timer is often more useful than money and troops. Therefore, it's often more beneficial not to break a tough gnome stronghold on turn 117, but to break it on turn 121 quickly and easily, even if you lose half a day of tempo. This loss will be forgotten in a week, but the extra 15 minutes of timer will remain.
However, with VT-style controls like 4000+500, you should consider the optimal use of the timer because half an hour is half of your reserve.
And yes, in the mid-to-late game, the timer is often more useful than money and troops. Therefore, it's often more beneficial not to break a tough gnome stronghold on turn 117, but to break it on turn 121 quickly and easily, even if you lose half a day of tempo. This loss will be forgotten in a week, but the extra 15 minutes of timer will remain.