Going for sub 45

[Stef4n]

It's been a while since my last post, so here's an update of my activities lately.

After the 6x1k, I did the 5k paced

5k paced session
Distance: 5.00
Total Time: 22:26
AHR: 182
MaxHR: 195

Number | Time | Avg HR | Max HR
1 | 4:30 | 166 | 175
2 | 4:27 | 179 | 183
3 | 4:31 | 185 | 189
4 | 4:28 | 189 | 192
5 | 4:29 | 193 | 195

Then, last monday, I had a 20.2k race, so I did not run a 10k this cycle. It was really hot, so I took it easy and finished in a time of 1h52min.

Last few days I did some easy runs as recovery, and I will do another 30 min easy today. Tomorrow I'll start off a new cycle with the 2k session.
Should I do a 4x2k or a 5x2k? And what pace should I aim at?

Thanks,
Stefan