Or at least even if it goes to zero after then, make it so that the mission doesn't go from accomplished to failed.

I just managed to beat area 150 boss with 57 seconds left and the little icon on top said the mission was successful, so I gave for granted that I could calmly raise the levels of unused Crusaders before reset (for more idols). I absolutely didn't imagine the bad surprise ahead... once the timer reached zero (I didn't even think it mattered anymore) the icon turned into mission failed. I was still hoping for just a graphic error and after reset I'd still get my rubies, instead I got none. To make it worse, I had to spend all my time turners (about 2 epic, 4 rare and many uncommon) to make it there just in time, which means I won't be able to attempt this mission again in the immediate future (I'll either need many more idols or at least 1-2 epic time turners).

Oh well, it happens, and I'll survive. This thread is here more as a suggestion/request to change that in the future, in two ways: either the timer stops once we beat area 150 in time, or we still get the rubies if timer keeps going and goes to zero afterwards. (Or if no change is planned, at least specifically state in the mission's description something like "WARNING! Time will keep going even after you beat area 150, so reset fast or you will risk failing the mission!)

Thanks for your attention and sorry if my post came off as a rant.