Feneckus wrote...
ISHYGDDT wrote...
GI and various weapons (Claymore, Piranha, Scorpion etc...)
ISHYGDDT wrote...
Beep Il wrote...
Kroguard.
Besides cheating.

I lol'd!

On a more serious note. I'm surprised people didn't mention this. But yeah, not many people are really trying to help in this topic, are they?
The thing which really made the difference for me in soloing time is kiting. It's pretty easy: the more you kite, the longer the time. If you don't ever need to run away from the enemy, then your time will be shorter. A lot shorter.
On objective waves too... Hacks, for example. Or escorts. If you manage to stay in the circle for the whole duration without running away... That will cut your times down a lot.
If you're willing to change class/loadout, then I suggest you try a vanguard solo. Given what charge can accomplish, I think they're probably the easiest class to solo without kiting.
That said, it's pretty much all tied to objectives, after a certain point. You can definitely get under 30, even 25 minutes, even if you get devices on wave 10. But once you try to get lower than 20 mins, devices are pretty much a rage quite. At least to me.