My 7 mth old SBT has two testicles one is in the right place the other can be seen but has not dropped into the right position yet, should I be concerned? I was told that it can take a year to drop?

if you're worried, you should really speak to your vet!  My youngest boy had one fully descended and one was there but the disappeared again-and if left, they can become cancerous, so we had him castrated, and the vet had to go right up into his abdomen to find the other one!  Nature can be strange sometimes!  But, best to ask the professionals if you have any concerns!

No, if it can be seen it has passed through the tight space in the pelvis and will appear as it enlarges.

The vet has said there is nothing to worry about and to wait till he is a year old, as it is moving in the right direction.