Sprints and timeboxing more generally is not about enforcing deadlines. That's such a common misconception and I wish it would die.

Timeboxing is about committing only a small amount of time and money at a time, so you can choose to double down on winners and stop investing in losers, rather than suddenly finding yourself having sunk 3 months of time into something that turns out wasn't that good after all.

The question is not "How much can we definitely complete in two weeks?"; it's "What things are promising enough that we are willing to dump two weeks into them, with no promise of ever making a profit?"

If one month counts as a small amount of time and money for your organisation, then you're doing it right!