Mass chunk regeneration

I'm trying to regenerate a large number of chunks, using two for loops, scheduling to regenerate each chunk with 2 ticks between them. The issue is, I will get a whole heap of 'Already decorating' errors and only some of the chunks get regenerated. I know the scheduler is working properly, as each chunk (after the first few, which go perfectly without errors) only reports its error once, and there is a noticeable delay between error messages if I increase the delay time.

My chunk regeneration code (it's an int because it returns codes as 0:regenerated fine, 1:had to be created, 2:failed):

Code:

int recreateChunk(Chunk chunk,Player p){
        if(!chunkExists(chunk)){
            try{
                chunk.load(true);
                chunk.getWorld().save();
            }catch(Exception e){
                Bukkit.getLogger().info("[ChunkFixer] Error generating at "+chunk.getX()+","+chunk.getZ()+": "+e.getMessage());
                return 2;
            }
            return 1;
        } else {
            try{
                chunk.getWorld().regenerateChunk(chunk.getX(),chunk.getZ());
                chunk.getWorld().save();
            }catch(Exception e){
                Bukkit.getLogger().info("[ChunkFixer] Error recreating at "+chunk.getX()+","+chunk.getZ()+": "+e.getMessage());
                return 2;
            }
            return 0;
        }
    }

I can just keep rescheduling them for a few ticks later any time I recieve the 'already decorating' error, ya?
Also how many ticks exactly does it take for a chunk to generate, decorate, and fully load into memory? I tried waiting up to 8 ticks between them, that didn't help. I thought it would try to do a chunk all in one tick?...

EDIT by Moderator: merged posts, please use the edit button instead of double posting.