Last time we had a Focus rework (2.0) all installed Lenses have been removed from frames and weapons. I would have appreciated it a great deal if it was done for this
DAILY FOCUS CAP IN 10 MINUTES | BEST WAYS TO FARM FOCUS IN WARFRAME 2022 - YouTube
it take 52.660.820 (211 days) focus points to fully upgrade all 5 focus schools, as of Focus 2.5 : r/Warframe