From the description of the Warlock class:
The Warlock table shows how many Spell Slots you have. The table also shows what the level of those slots is; all of your Spell Slots are the same level. To cast one of your warlock Spells of 1st level or higher, you must expend a spell slot. You regain all expended Spell Slots when you finish a Short or Long Rest.
...and the section on adventuring:
A short rest is a period of downtime, at least 1 hour long, during which a character does nothing more strenuous than eating, drinking, reading, and tending to wounds.
Say a Warlock uses a spell slot to cast Hallucinatory Terrain - a spell that lasts 24 hours and requires no concentration (read: doesn't require strenuous activity). They then take a short rest to recover the used spell slot. Though this doesn't seem correct to me, I see no rules dictating that the spell ends. Are warlocks able to abuse short rests to cast long-duration spells without consuming spell slots?