It's really not hard to speed run strikes while killing everything. It's even better if you have a team. Two nights ago me and two friends decided to see just how fast we could do some of these strikes. They both got on their Titans and switched to their defender sub-class. One ran Weapons and the other ran Blessing. I hopped on my Warlock (because I needed Hadronic Escence). I threw on my Obsidian mind and switched to Voidwalker. We ran through about 10-12 strikes, killing everything, and each one took between 9 to 11 minutes. We got a ton of glimmer really quickly too. We wanted to see how many orbs we could generate, so on the Omnigul strike, it took us 11 minutes and we EACH picked up over 140 orbs. Honestly I find it more fun to kill everything.