Spearbit #68: Simplified the time stretch calculation

[jalextowle]

Addresses Spearbit Issue #68.

[github-actions]

Hyperdrive Gas Benchmark

Benchmark suite	Current: ad3b8a9	Previous: 46c834d	Deviation	Status
addLiquidity: min	33974 gas	1546 gas	2097.5420%	🚨
addLiquidity: avg	140319 gas	67936 gas	106.5459%	🚨
addLiquidity: max	336682 gas	293159 gas	14.8462%	🚨
checkpoint: min	29265 gas	1182 gas	2375.8883%	🚨
checkpoint: avg	106468 gas	48477 gas	119.6258%	🚨
checkpoint: max	199040 gas	191559 gas	3.9053%	🚨
closeLong: min	31333 gas	1492 gas	2000.0670%	🚨
closeLong: avg	99545 gas	29374 gas	238.8881%	🚨
closeLong: max	217410 gas	152303 gas	42.7483%	🚨
closeShort: min	31335 gas	1494 gas	1997.3896%	🚨
closeShort: avg	98168 gas	33444 gas	193.5295%	🚨
closeShort: max	179837 gas	149156 gas	20.5697%	🚨
initialize: min	31350 gas	1451 gas	2060.5789%	🚨
initialize: avg	248546 gas	213962 gas	16.1636%	🚨
initialize: max	319421 gas	253953 gas	25.7796%	🚨
openLong: min	33415 gas	1499 gas	2129.1528%	🚨
openLong: avg	124223 gas	51658 gas	140.4720%	🚨
openLong: max	245841 gas	185562 gas	32.4846%	🚨
openShort: min	33820 gas	1520 gas	2125%	🚨
openShort: avg	135725 gas	51482 gas	163.6358%	🚨
openShort: max	250793 gas	181325 gas	38.3113%	🚨
redeemWithdrawalShares: min	46854 gas	1488 gas	3048.7903%	🚨
redeemWithdrawalShares: avg	72774 gas	22375 gas	225.2469%	🚨
redeemWithdrawalShares: max	142865 gas	109301 gas	30.7079%	🚨
removeLiquidity: min	31183 gas	1530 gas	1938.1046%	🚨
removeLiquidity: avg	194349 gas	151225 gas	28.5164%	🚨
removeLiquidity: max	325809 gas	325781 gas	0.0086%	🚨

This comment was automatically generated by workflow using github-action-benchmark.