Guys I'm test sending Octo between 2 wallets I have and have found wallet either freezes or gives transaction too large error on transactions over 50,000. I managed to get 1 transaction through of 100,000 but no luck after that. I will be burning close to a million octo, so at 50.000 each that would be close to 20 transactions. Would that be too much? Or is their some workaround I don't know about for large transactions?
The problem with the transaction being too large isn't the number of coins, but the number of different inputs. Every transaction received by your wallet equals an input. If you have a bunch of smallish deposits into your wallet, then you will quickly max out the transaction size.
The wallet tries to combine the largest (coin wise) inputs together to create the withdrawal. Once it gets through the larger coin chunks, it starts using smaller and smaller chunks of coins. Since a finite number of inputs can be placed into a block, less total coins fit into a transaction.
If you send all of your coins in large chunks to a single address, you should be able to then send them all at once to the burn address. I sent over 1.15 million yesterday in one chunk after combining them to a new address. It took me around 15 transactions to get my coins over to the new address. Once I had that done they easily sent to the burn address in a single chunk.