Deliberately waiting until the offer ostensibly expires seems like an advanced technique, but simply disregarding the time frame seems pretty safe. Exploding offers are incredibly weak; they're a way of slapping your negotiating floor on the table before your counterparty says a word.
There's something to be said for the idea that losing a seed funding deal to term explosion is a dodged bullet, too.
There's something to be said for the idea that losing a seed funding deal to term explosion is a dodged bullet, too.