I stacked mine pretty close and things still panned out as normal. For reference:Wondering if I stacked up upgrade offers a bit too close together so that the 3 month spend window in the 1st somehow is impacting the second...
Day 1: upgrade no-fee Hilton to Surpass
Day 36: complete 3k spend, 150k bonus posted within ~3 days
Day 40: upgraded again to Aspire the day after the first 150k posted
Day 90: completed 4k spend, 150k bonus posted within a few days again