i see the images were removed for possible inaccuracies. i can confirm on the second to last fight,it is 2 gem per hour to skip timer. i got one fight left, it takes 75 coins to claim the block with one fight left. i'll update/verify coin requirements as soon as i do the last fight in a few minutes.
update:
after fight, 295 coins to claim.
after marauder chest, 300 to claim.
after legend essence, 305 to claim in order to reach last fights.
just waiting on last collection in a few hours for my last 600 coins. i only have 193 coins left right now....so it's possible i might be able to skip a fight to save on gems.
update (last fights):
after first fight, first timer is 3 hours 11 minutes 40 seconds...240 coins to claim entire block,or 12 gems to skip timer....so looks like 3 gems per hour to speed up....so i suggest if you are gonna gem it up,wait12 minutes to save 3 gems.