Very fun grind. Most levels were in that sweet spot (for me) where they're challenging but not too grindy so I can still get them within one session.
I was surprised when I saw the time each level took. The silver that took me the longest was Tower XVI, which I didn't think would be that hard (even though the base level is by far the hardest of the lobby), quickly followed by Raindrops on Roses (not a surprise since the level is so damn long).
When I started this I thought Belated Valentine's Day would be the hardest silver to get, since it's pretty long and I am absolutely terrible at heartbounces, but it turns out it doesn't even make the top5. That's mostly due to pretty much every bounce being cheesable with heart ultras though lol.
(also sorry for the visual glitch at the start of Toggle Theory)
Timestamps for every level :
0:00 - Sands of Time (35mins)
2:58 - Slime Time! (36mins)
5:44 - Lethal Laser Laboratory (8mins)
6:56 - Starry Ruins (1hr 7mins)
8:20 - Undergrowth (34mins)
13:28 - Lost Woods (14mins)
16:26 - Jellyfish Sanctum (32mins)
18:12 - Tectonic Trenches (29mins)
20:06 - Golden Dawn (43mins)
22:13 - Forest Rush (51mins)
24:56 - Attack of the Clone (1hr 35mins)
27:17 - Bee Berserk (1hr 12mins)
32:37 - Java's Crypt (35mins)
36:31 - Raindrops on Roses (2hrs 31mins)
43:52 - Toggle Theory (33mins)
45:22 - Superstructure (58mins)
48:14 - The Tower (XVI) (2hrs 37mins)
52:29 - Starlight Station (1hr 05mins)
55:50 - Dusk City (1hr 20mins)
59:26 - Synapse (2hr 14mins)
1:03:37 - The Lab (57mins)
1:06:56 - Belated Valentine's Day (1hr 29mins)
1:09:30 - Thinking with Portals (38mins)
1:11:04 - Rightside-down Cavern (1hr 39mins)
1:13:44 - Call of the Void (28mins)
1:17:14 - Rainbow Berry Collect