Its Time_dilation(time slowing), not time travel. Time Dilation is a difference in the elapsed time measured by two clocks, either due to them having a velocity relative to each other, or by there being a gravitational potential difference between their locations. After compensating for varying signal delays due to the changing distance between an observer ...
The Ribhus, a group of three Gods in the Rig Veda, are said to have been mortals and to have attained immortality. They are said to be the sons of Sudhanvan, a descendant of Angiras.
Rig Veda I.110 explains their attaining immortality.
THE holy work I wrought before is wrought again: my sweetest hymn is sung to celebrate your praise. Here, O ye Ṛbhus, ...
According to Padma Purana too, Padma Kalpa and Varaha Kalpa both are not same.
Padma Purana, Srishti Khanda, Chapter 3 - Kinds of creation:
At the end of the night which is of the same measure (as the day)he
again brings about the creation. Such is the year of Brahma and
likewise are his hundred years. Long is the life-span of that great
one, viz. ...