Just an ordinary professor. I cannot do miracles. If students just repeat any bullshit that they read, without thinking critically, I cannot help them...
Whenever the demand is greater than the capacity, some transactions will inevitably be delayed.
Whenever the demand is greater than the capacity (supply), then the transaction price increases and those who will pay more get their TX executed, those who dont will have to wait a bit more.
Thus you can still send your TX in normal amount of time, you just have to pay more to get it cleared.
And it's not random transactions we talk about, but depending on who pays more. It's an auction market, and who bids more will get priority.