Got Teshar in the nat 5 selection but wanted to replace soon with something else as to not waste the selection on a farming/pve monster (thinking of grabbing zaiross, amber, lamelia, or anything you guys can recommend!) It was 100% run with Teshar team (with Teon, Prilea, Luci and Wind Homu) and the time was around 28-40 seconds.   
  
Wasted a lot of Mana and Energy reruning and retrying the best team, trying to use Luna, Kyle, etc. This is the most successful I have been and wanted to share it with everyone! And it's average is less than a minute per run, which is good enough for me as a f2p (not infinite crystals lol). Fastest was 30 seconds, slowest was 57 seconds. 

I know it's not F2P, but you can replace Luci with a Mephisto if you have him. If you don't have him, I'm not too sure how to replicate this team. I guess a deborah would work somehow? Or maybe Luna if your Julie + akha can clear the waves together. 

The main thing that made my runs more successful was skilling up my Wind Homu and using Akhamamir as the lead (allows me to lap the boss sometimes). My Wind Homu can one shot the boss at half hp with his 3rd skill now! This led to less fails (around 1 fail every 30-60 runs). I fail when Prilea fails to def break the boss twice in a row, which is annoying since her accuracy isn't that bad. 

My next goal would be to make my Luci hit even harder (not sure why when he moves after Julie, he cant clear the whole wave, Might be due to the golem's passive barrier skill? Julie not hitting hard enough? Too hard? Will know once I get to improve her runes and maybe skill her up as well.) Might fail if I make Julie hit harder since Mid boss has barrier passive too. I am also considering max skilling my Akhamamir (but will not use devilmons, will just have to grind for guild pts to buy ifrit pieces maybe!)   
  
Here to listen in to some tips as well on where I can improve! 

Finally got a stable GBAH team w/o Teshar!