It was finally confirmed. For future reference, how much size is safe to get transaction confirmed within a few hours?
No one can give you an exact answers for all situations. it depends on mempool conditions that changes very fastly.
Check mempool condition there:
https://jochen-hoenicke.de/queue/#0,24hOne hour means about 6 blocks and with that third chart, one block takes 1 MB (maximum from tip of the mempool). So one waiting hour will be roughtly 6 MB from tip of the mempool. It is applied for constant condition of the mempool. In reality, it is changing and what you can get is an estimation only.
As said, because of uncertainty of mempool, you always have to prepare for bad situations by turn on the RBF -- Replace-by-Fee for your transactions.