Till doomsday phrase informal
Forever.
She wants to put off till doomsday.
If he were Prime Minister, the recession would last till doomsday.
You can dig here till doomsday, but you will never find water.
Forever or eternally
1. Used to indicate something lasts forever
2. Said when you believe something will never happen
Said when one is looking back on something enjoyable or worthwhile in the moment that it was happening even though it was impermanent
The party came to an end, but it was fun while it lasted.