If you are using rabid set and a scepter on a condi shatter build in open world, you can take Rune of Tormenting. This way, you'll have +45% condi duration on torment and +33% on confusion due to Illusions minor grandmaster trait. Grab Signet of Midnight utility and Superior Sigil of Malice and you'll have another +30% duration on both. To sum up, it's basically +75% duration on torment and +63% duration on confusion without a single piece of viper/trailblazer set. However, it's worth mentioning that Superior Rune of Tormenting and Superior Sigil of Malice are rather expensive, so it might be kind of difficult to afford them for a new player. If you want some overall condition duration, you can run 4x Superior Rune of Nightmare or 4x Superior Runes of Traveler (Traveler Runes provide less condition duration but give extra 15% boon duration) + 2x Superior Runes of Trapper, although you need to be lvl 400 in Armorsmithing to craft Trapper runes (not sure if there's any other way to get them). If you don't want Condition Duration runes, your best choices are probably Superior Runes of Berserker or Superior Runes of Renegade, but you need Viper or Trailblazer set then, because pve Condi builds are underwhelming without condi duration. The cheapest option for Rabid/Dire is Superior Runes of Undead as they give you bonus condi damage based on your toughness, and with these sets you'll have quite a bit of it. However, this rune isn't very good, so you'll have to replace it with something better as soon as possible. Also, always remember to have Signet of Midnight and Signet of Domination on your utility bar as a condi mesmer. Their passives are free condi duration and condi damage.