Originally Posted by
Viennafly
It also depends where LH755 arrives and where LH454 departs. Yesterday LH755 arrived at gate B28A, LH454 departed from Z52. I am not sure if you can transfer from B to Z without passing immigration (and security). It is certainly at least a 20 min walk + waiting time.
The Skyline route requires security but not immigration when transferring from B to Z.
In addition as the OP is arriving from Bengaluru, India; even if LH 755 arrives at a Z gate, the OP would need to clear transfer security at FRA.