Sounds fair to me when your debating only 3 minutes vs 1.5 its still damn fast to sell out! I kind of miss the first 24 hours of sales like with Chaos that are not timezone sensitive but time window sensitive as I wasn't able to buy in time as I was busy that day and only could look at it 2 hours later.
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From Chaos launch
In order to attempt to prevent a huge rush to buy packs when the general sale begins, we will make it so that ALL packs purchased in the first 24 hours of the general sale will be eligible for all of the remaining airdrops.
For example, if over 3M packs are sold in the first 24 hours of the general sale, then there will be three new cards airdropped to pack purchasers, and EVERY PACK purchased in those first 24 hours will be eligible for ALL THREE of the airdrops.
This means that there is no rush to get packs quickly when the general sale starts - everyone will have 24 hours to purchase their packs and receive all of the same benefits as players who purchased earlier.