2.5yr
If my partner is looking after the 14 month old, I often spend a couple of hours doing diy - cutting wood with a jigsaw, drilling, screwing etc, with 2.5yr old toddler outside with me, attempting to help getting me things and watching me. Obviously it slows me down, but she's having fun and I'm getting something done
I cut the grass with her either helping or just playing, even if 14 month isn't napping and they're sitting together in the sandpit I can cut grass. I'll do an hour of gardening if baby is napping, toddler will potter around, play with plant pots for aggggges sometimes.
Admin work - no chance, unless on my phone, as she just wants to play with laptop.
Reading - I can do 20 mins, if baby is napping
Cooking - yes, fine with baby & 2.5yr old, has been fine since less than 2yrs. Sometimes older one helps a little.
Workout - nope.
Next spring when baby is 2 and older one 3, it'll be a game changer. I'll be able to do some diy and a fair bit of gardening whenever, they'll potter or play. Even now, 2yr old can have tv on inside, bifold doors open and she'll come in and out, over an hour or so, bit of tv, bit of sandpit, bit of following/copying me etc