Concentration on a spell while casting a spell with a longer casting time [closed]


Is Casting a spell with a casting time longer than 1 action considered „concentrating“ on it, for the purpose of keeping concentration on a different spell already cast?

Ex.: flaming Sphere on the field, next round starting to cast conjure minor elemental (1min). Does the flaming sphere puff at the start of the minute or at the end when the spell slot is spend and the spells effect takes place?