If you mean cycling to a new set in your mention to 'reset'. That doesn't take long at all 1-2 seconds. And if you have to cycle a bit usually need to only do it 1-4 times. 1/2 - 4/8 seconds. Time may vary but a very easy team I can beat in 1 minutes (or less) (this is what we all call super easy). A easy team in 2 minutes. A average strength team can take up to 5 minutes. And a hard can take up to 8 minutes or even longer (really depends). And I hit very easy between 1-4 cycles.
My level : 747
Armor : Dragon Armor
Typical gold offered :
1 - 600 gold (very easy) * 2 = 1,200 gold
2 - 800 gold (easy) * 2 = 1,600 gold
3 - 1,000 gold (medium) * 2 = 2,000 gold
4 - 1,500 gold (hard) * 2 = 3,000 gold
Typical time for completion (based on my performance) :
1 - 1 minute (very easy)
2 - 2 minutes (easy)
3 - 5 minutes (medium)
4 - 8 minutes (hard)
Battles : 60
Battle Time : 60 minutes
Cycle Time (to get to very easy) : 60 * 2 = 120 seconds / 2 minutes
Gold Earned : 72,000
Battles : 60
Battle Time : 120 minutes
Cycle Time (to get to very easy) : 120 * 2 = 240 seconds / 4 minutes
Gold Earned : 96,000
Even if you play for 8 hrs you will encounter only around 14-20 minutes of Cycle Time (wait time).
So its really not worth factoring in or worrying over.
Now lets say you played for 8 hrs
Battles : 60*8 = 480
Gold Earned : 72,000*8 = 576,000
Battles: 30*8 = 240
Gold Earned : 384,000
You earn 192,000 more gold on very easy over easy within that 8 hours.
So it is very much worth cycling to very easy and only considering very easy battles to engage. Those that feel even easy is applicable just waste extra time. For myself I would waste an additional 52 seconds over cycling to a very easy at maximum 8 seconds.
Note: This is considering battles at 1x speed and not up to 4x. Since I tend to just play at 1x. Your speed and performance may vary from my own. Though, I would say I am a pretty average player. So these rough figures are not based around a poor performance.