i have a theory about "I can hold everything together for only so long" Since Polka Dot is the only one who can go through other channels by themselves, everything is depending on her to hold everything from collapsing (the channels being destroyed by clock or something) but she can only do so for a short time.
So I guess my theory is right I think Polka dot is representative of the TV channels, That probably explains why polka dot's dots AKA portals that go through other channels, In ITFT 3:00 we see polka dots go through one of hers portals leads her to another channel, In ITFT 1:00 space which is the purple dot could possibly be another channel of a show or channel document. (Edit: and also the bike the possibly be from another channel, could be from the same channel from ITFT 3:00, or could be from another channel that we don't know for now.)
wheel at the end: WOAH- (literally me when itft lore) (literally me when itft) (literally me when) (literally me) (literally) (literally me when the) (the)
also, if go at the very end where it is a black screen with nothing, take a photo, turn up the exposure (all the way up) you will see clock for some reason??