Just a minute is easy to say when you are finishing a task. If it repeatedly means a much longer wait, it gives a child little useful information. When you do not know the exact time, describe what will happen before their turn instead.
You might say that you will help after putting the hot pan down, or that the family will leave after everyone has their shoes on. Choose a cue the child can understand and that you can actually follow. Do not replace an uncertain clock time with an equally uncertain promise.
A younger child may need something concrete to do or a place to wait safely. Offer a small suitable activity if it fits the situation. For an older child, explain whether they can begin part of the task independently or should wait for help.
If the need is urgent or safety-related, do not insist on the ordinary waiting rule. Teach the difference in language appropriate to the child and remain responsive. A family expectation about not interrupting should not prevent a child from seeking help when someone is hurt or a situation is unsafe.
Timers can help when the interval is known and meaningful, but they are not required. If you use one, be clear about what happens when it ends. Repeatedly adding more time can make the signal less useful than simply explaining the delay.
When the promised cue occurs, acknowledge the child and follow through where possible. If the situation changes, update them rather than leaving them to ask repeatedly for information. You can say the task is taking longer and explain the new next step.
Notice a manageable wait without turning it into a moral achievement. You stayed beside me while I finished paying describes what happened. Avoid comparing siblings or suggesting that a child who struggles is deliberately making life difficult.
Waiting is affected by age, tiredness, interest and the setting. Plan shorter waits where you can and bring support for unavoidable ones. Clear information and reliable follow-through help the child understand the situation, even when they still dislike having to wait.