[j-conn]

Thanks for this.

get it from investors with as long a time horizon as possible Can you elaborate on how to evaluate this? I'd imagine you could just ask them if you already have a relationship, otherwise by looking at the age of their fund?

[mathattack]

You hit the first two suggestions - age of fund is a big clue, and just asking them. Reputation of the firm matters a lot too.

If you're up front about your expected burn rate and the amount of funding you're asking for, that will help select the right group too. (You can't ask for 10 years of funding, but you can go for more than the year that many settle for)