How long can/does your 3 m.o. sit in a Bumbo before they get irrevocably droopy? Do they have their head up & looking around or leaning on their shoulder or chest? (I'm trying to figure out if DS is ready for his yet)

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Re: 3 month old in a Bumbo
This. But she's been in it since about 8 weeks. She's officially a sitter now, but she only lasts for a minute or so.
This. Before 4 months, we'd use it occasionally as part of our daily activities. I'd put the tray on and give him toys on the tray so that he could work on his hand/eye coordination. We now use it daily to feed DS his cereal. It won't be much longer before he's too much of a chunk to fit in it, though!