Temporal Mechanics - How to handle time in D&D 5e 

Not nearly as bad as the limits for making some spell effects permanent. Casting a spell every day for a year? Ouch.

@@RulesandRulings yeah, not to mention that a lot of those spells also have consumable material costs So if you want to make your own permanent teleportation circle, not only do you have to cast the spell every day for a year, but each casting costs you 50 gold, for a total of 18,250 (assuming a 365 day year) But it’s not just that you need over 18,000 gold, you need over 18,000 gold worth of _materials_ So you have to find places that sell those materials, if your DM is nice, they might let you get them all at once at some kind of magic superstore, but realistically, no place is going to have that much ink and chalk lying around at at one time