donpizmeov and LB, I think you're both slightly misunderstanding each other, LB is describing a situation where he has 10mins to go to destination at Reserves and elects to continue whilst donpizmeov is suggesting a scenario where there is a suitable airport below and you continue regardless. I'd say you're both correct because you're both describing different situations?
I'd say you'd both agree that with a suitable airport directly below you'd be silly to take the additional risk than take the extra 30mins to stop in for fuel and be sure and that with a suitable destination only being 10mins away at reserves it'd be silly to take the risk on a random field below no matter how lovely and short the grass looks from above.